Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a1f33cb8fce632…

MALICIOUS

PDF

67.8 KB Created: 2020-08-12 00:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41ee329162de97c0156596bc097921e0 SHA-1: 286bd2f6e5517d54c3cc29fea17d46c4f4798b66 SHA-256: 71a1f33cb8fce632f12dc2525cfc955a140b199437f691d435d0ce1806793978
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to 'new anticoagulants pdf' and includes the malicious URL. The presence of many links to external PDFs, some hosted on potentially compromised or malicious domains, indicates a link farm or redirection strategy to deliver a payload or lead users to malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.ru/pify?keyword=new+anticoagulants+pdf
    • http://vawiberol.guidedchildrensadoration.com/uploads/1/3/0/9/130969592/bekebibijamuwuzudap.pdf
    • http://files.witchdoctorpoet.com/uploads/1/3/1/8/131857024/gowupibapevova_muzorin_sujezenoxev_putuguleru.pdf
    • http://files.sdsusna.com/uploads/1/3/2/7/132740804/dozumumilobiturofupe.pdf
    • http://files.atlantatuskegeealumni.org/uploads/1/3/1/6/131607407/fonizexafez.pdf
    • http://files.dsmwoodwork.com/uploads/1/3/1/8/131856331/gefusemevu_tufuzasejosut_benagudabu_kegiwezo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/4822/9271/files/tuwanoxibisujufaxobe.pdf
    • https://cdn.shopify.com/s/files/1/0437/0871/1080/files/gojif.pdf
    • https://cdn.shopify.com/s/files/1/0430/0292/1111/files/tapojoliresuturoselid.pdf
    • https://cdn.shopify.com/s/files/1/0440/8714/8709/files/sabepubitogimulaxawik.pdf
    • https://cdn.shopify.com/s/files/1/0431/9726/8128/files/3940329617.pdf
    • https://cdn.shopify.com/s/files/1/0432/2571/0756/files/83585594633.pdf
    • https://cdn.shopify.com/s/files/1/0432/0336/2973/files/ripodifegapukag.pdf
    • https://cdn.shopify.com/s/files/1/0438/4430/5056/files/how_to_change_deoxys_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/0119/2352/files/89286745970.pdf
    • https://cdn.shopify.com/s/files/1/0438/8470/7992/files/zuporopusewufiwuzavo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4646/9793/files/gifonedazexuvidiko.pdf
    • https://cdn.shopify.com/s/files/1/0428/3842/5767/files/58063019457.pdf
    • https://cdn.shopify.com/s/files/1/0438/4302/7104/files/78463922530.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_off0000c5b9.bin
c3d2c2b0ed73349eb7b842d8e5be602914a09a10cd78d6161741bdfccbe2c948		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B9 5288 bytes
font_01_sfnt_off0000d7e1.bin
7f0e5d3f3a56bf5d0a881caf402a3e5b4d626d2e642546c18fce024eac9480ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E1 13212 bytes

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