Malicious PDF — malware analysis report

Static analysis result for SHA-256 87042020ace61343…

MALICIOUS

PDF

61.7 KB Created: 2020-10-20 15:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3504cfa333395d3ffcb7fd0ae882a57c SHA-1: f25dab9ba1b595efd1e1160f60520d5ddd309bdf SHA-256: 87042020ace61343734693eb3c2f94727fcb46299c62e3ac714d03847d3a4481
154 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://gettraff.ru/123?keyword=zombie+catcher+mod+apk+new+version'. The document body also contains this URL, suggesting an attempt to lure users to malicious content. The presence of numerous other PDF links indicates a potential SEO link farm or a method to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/123?keyword=zombie+catcher+mod+apk+new+version In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377674/normal_5f8d55e076a4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374708/normal_5f89dd89e46bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374986/normal_5f8b323d9db59.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/1/0479/3208/0295/files/accademia_florence_guided_tour.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7673/9770/files/the_great_gatsby_chapter_3_quotes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6032/8608/files/44230654090.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7275/6648/files/beduzotu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0165/8522/files/animales_nativos_de_puerto_rico_en_peligro_de_extincion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dadf93af-ed46-4c74-91f8-fd84f26ebfa8/jenetijupituwabuniko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/037c802b-2952-4a14-be46-a3e94374df26/bomiminawatavetasufuxebe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4daea0de-92ed-47b7-a6ea-010f7506281b/dapedevarafinujeruwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b0bee3c-961b-4f1f-b586-4b1b2d43e4f5/18170622784.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc828da5-a21a-4e1a-8d7f-3a624b7916f4/29613450253.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5491/4981/files/android_spannable_grid_layout_manager.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9186/0379/files/accountable_talk_stems_for_ela.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4541/2261/files/classical_mechanics_and_statistical_mechanics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8950/2110/files/92706385069.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/0321/5778/files/35387002158.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000a6eb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA6EB 29376 bytes
SHA-256: 6e9d0409f012ef5aa8021609fffb3c0e9c92be2a0ab319bc4ceedd592e87ccc9
font_00_sfnt_off00007135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7135 5384 bytes
SHA-256: c79265e33ab5f54bae70193c8cc0bf7c6300f371c6db88e5fab23e96cae72b7d
font_01_sfnt_off00008364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8364 10448 bytes
SHA-256: 4bb502bae0a09e6a641a34507f3643d8f66e17ec88064fc1b296e8489d6dd412
font_03_sfnt_off0000db40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB40 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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