Malicious PDF — malware analysis report

Static analysis result for SHA-256 64ad45d7164a2b71…

MALICIOUS

PDF

57.3 KB Created: 2020-07-19 05:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1da834fa2f58d2579d57e98cb92e7c4c SHA-1: ae064f576a20aebbd76f61ee9b28be2a691e31a0 SHA-256: 64ad45d7164a2b71980613b79f974455b24b0c43036195701e958abd628fc362
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, indicating a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests it is masquerading as an educational worksheet to entice users to click on these malicious links.

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://ttraff.com/wb?keyword=distance-time%20graph%20and%20velocity-time%20graph%20worksheet
    • http://files.smdevents.co.uk/uploads/1/3/1/6/131607662/ferikiwajifom.pdf
    • http://files.twhitteker.com/uploads/1/3/1/6/131606133/7fc4171f8.pdf
    • http://files.dojoofkickz.org/uploads/1/3/0/7/130739238/8753707.pdf
    • http://files.biomems-supply.com/uploads/1/3/2/6/132695566/borobim-wisobaliratum-zegiriged.pdf
    • http://files.bcrowleylaw.com/uploads/1/3/1/4/131408209/3888918.pdf
    • http://files.foxacademyofdance.com/uploads/1/3/2/8/132815119/4910788.pdf
    • http://files.katiemachain.com/uploads/1/3/1/4/131455283/57a787ca629.pdf
    • http://files.exploringvoice.com/uploads/1/3/0/7/130740553/3168216.pdf
    • http://files.loiscolemanneufeld.com/uploads/1/3/0/7/130738969/texasevomadezu_depiforevukenis_xetakovanimiz.pdf
    • http://files.feastva.org/uploads/1/3/0/8/130874543/betiwek.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://jumupetilik.files.wordpress.com/2020/07/puxitikujowevudidi.pdf
    • https://bawegepagema.files.wordpress.com/2020/06/66508997482.pdf
    • https://bapezofizu.files.wordpress.com/2020/07/xuwujaritujol.pdf
    • https://fojekiv.files.wordpress.com/2020/06/nebedumuno.pdf
    • https://cdn.shopify.com/s/files/1/0431/7013/6230/files/lesonikowudadodenavo.pdf
    • https://cdn.shopify.com/s/files/1/0437/0504/1051/files/bovuwofujadopejij.pdf
    • https://cdn.shopify.com/s/files/1/0431/9870/9918/files/80511869052.pdf
    • https://cdn.shopify.com/s/files/1/0429/6844/9180/files/19284425630.pdf
    • https://cdn.shopify.com/s/files/1/0435/3504/0664/files/70720299929.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/93616534700.pdf
    • https://cdn.shopify.com/s/files/1/0428/3429/6988/files/15570575720.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/soparuvuridove.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000977d.bin
769a3c02867fe35291f88dc487f5308ab99a45388ac59c2ea10df629b3a758d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x977D 5624 bytes
font_01_sfnt_off0000aa8d.bin
7c8708a85eafc462867607d7a187fa97bc2f0f2191060fc1598f3927c8649c98		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA8D 13652 bytes

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