Malicious PDF — malware analysis report

Static analysis result for SHA-256 319149d8289ccbed…

MALICIOUS

PDF

70.5 KB Created: 2020-10-29 08:18:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 48c7ba5a91b71d88e005e10296d5735f SHA-1: 31687859066a03ce81f8be6cb6745e3f7b389f38 SHA-256: 319149d8289ccbedf7561700d4c3d722ca9ac2f04b40bae246ebfeba4bb4a8be
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by an ML classifier and contains numerous embedded links. Several heuristics indicate it functions as a link farm, with many links pointing to disposable hosting and redirector infrastructure. The primary redirector URL is https://gettraff.ru/strik?keyword=my+father+is+strange+drama+cast, and a prominent link farm URL is https://biwugina.weebly.com/uploads/1/3/1/1/131163984/b68733920eb9.pdf. The document body contains garbled text but includes the same redirector URL, suggesting a deliberate attempt to obscure the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gettraff.ru/strik?keyword=my+father+is+strange+drama+cast In PDF document text
    • https://biwugina.weebly.com/uploads/1/3/1/1/131163984/b68733920eb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381289/normal_5f9310c924508.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/jamevuz-fepiwu.pdfIn PDF document text
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/4464855.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388842/normal_5f95e1bfc69d7.pdfIn PDF document text
    • https://palozemoxapido.weebly.com/uploads/1/3/4/3/134366311/pulodido.pdfIn PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/e672fbfe327f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373304/normal_5f926e7842d6e.pdfIn PDF document text
    • https://zarurirabug.weebly.com/uploads/1/3/4/3/134355130/7434077.pdfIn PDF document text
    • https://jedarixires.weebly.com/uploads/1/3/0/9/130969076/vemir.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/rugatu-rugot.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/bawap.pdfIn PDF document text
    • https://kufazijofiw.weebly.com/uploads/1/3/0/7/130776126/nusinasariruruna.pdfIn PDF document text
    • https://sixapinipuso.weebly.com/uploads/1/3/1/3/131384402/4893648.pdfIn PDF document text
    • https://latenenagizogip.weebly.com/uploads/1/3/2/6/132696064/koxevexonafolegalig.pdfIn PDF document text
    • https://kurikezexiwu.weebly.com/uploads/1/3/0/7/130775092/3621501.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0500/1229/1264/files/6604155259.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/befdb05d-9047-45c9-a060-e6846ffcc964/aldo_leopold_um_de_almanaque_de.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85cd39c3-1a3e-4acf-bb20-23c8d33216f0/signification_de_scurit_en_urdu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8489/9011/files/ocr_software_to_word.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1344/7584/files/zezojazuporunit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/7582/7867/files/birelizame.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7368/3100/files/12342162559.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d919b8b-8701-4522-8994-cf822f9ac87c/kunegobevekadav.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000c7d3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC7D3 29664 bytes
SHA-256: 47f5c3311e7c10491a787507c056b1611345a7dfbb947aa2792ad1c5690b6cd6
font_00_sfnt_off00008196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8196 4464 bytes
SHA-256: cd4573550444042610a6af0de2ef4b4620cc2b165aa499ec4b1167a6691c3fb9
font_01_sfnt_off0000916c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x916C 5188 bytes
SHA-256: b9c4037ce92ff33b0ce324ec516fa2d06d09a502e1d5757f89aa85fb16ca9db9
font_02_sfnt_off0000a2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA2E9 10828 bytes
SHA-256: e11a037520806801271bd4a913ab5f6f79d258d80be44921d7eeb2658285cb5f
font_04_sfnt_off0000fb84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB84 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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