Malicious PDF — malware analysis report

Static analysis result for SHA-256 25e3f2f2133c2c00…

MALICIOUS

PDF

43.8 KB Created: 2020-10-15 11:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c9ba2a5f9c9a55acf4a9138a53e27c06 SHA-1: 48b34dca1e4cedf3e5ee80f895c33e61e9d2ee34 SHA-256: 25e3f2f2133c2c0062c43afea16185e3ff25eabcdf3c0ee2be5c406be5946eca
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded URLs, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text referencing 'hypstar video downloader apk' and the malicious URL, suggesting a lure to download potentially unwanted or malicious software. The presence of numerous other PDF links further indicates a link farm used for SEO manipulation or traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://ggtraff.ru/123?keyword=hypstar+video+downloader+apk In PDF document text
    • https://ridolagu.weebly.com/uploads/1/3/0/7/130775195/a5315a633a034.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/nitogewekarab.pdfIn PDF document text
    • https://mokitigek.weebly.com/uploads/1/3/1/6/131606839/8d9293d8e.pdfIn PDF document text
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/zemosakegup_gopeworinibes_nowatope.pdfIn PDF document text
    • https://wegupufula.weebly.com/uploads/1/3/0/8/130813429/kubazu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367627/normal_5f87bdd8174d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368740/normal_5f878a4b3978d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366004/normal_5f87587da0f8e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4061/3286/files/sazoxatugukuwegedadelune.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2305/6545/files/pojitilulokezetijod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/8028/9956/files/androdumpper_apk_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/7069/6855/files/estreimiento_y_embarazo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6a69633-1538-4cd2-9408-0376435086c3/48065643054.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aca7976c-22c5-41b1-9686-8b997beb4d27/11212754721.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f92962e4-0270-47d5-aa99-9ab0bbbe8735/77853606856.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06f6d9ee-c55e-4d8b-b184-26e17fbc7d35/xejegodojuposu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97403c3c-015a-476b-937d-5edd4db2792a/18582697004.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/5421/1487/files/vewozotuxitek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/0536/6431/files/leather_open_toe_booties_size_11.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c4836a1-5827-40f8-a59b-5e7db1094caa/munituzi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b55c773-9e26-4854-a507-263f7c5b5877/6906080272.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abc66ab0-053f-41db-96d8-7d7cb1659960/70556609261.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ea40e25-6374-431e-a9bd-8f6b7567aa48/97461022331.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64b30bbe-5418-471b-b582-a158a4f6da97/ruwere.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69BD 5232 bytes
SHA-256: 0f3748c2905bb61ede36738826cbb1a0b79715623334d7abd264e3b78fc3fc34
font_01_sfnt_off00007baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BAF 11896 bytes
SHA-256: b0c45d8244b23ce49bb2a40943e95b06bd895c919077a28ef2044d206748622d

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