Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d1f667feb0d1658…

MALICIOUS

PDF

42.2 KB Created: 2020-08-26 05:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d481523b2145acba48f6007e460dd9d SHA-1: 4f92cb8bee45803778fd62a7080f1f2fecba928d SHA-256: 5d1f667feb0d16580197cfb560609d2b6451fa88393d0d0534a42f520943e20c
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to disguise malicious activity as a technical document.

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.me/pify?keyword=dometic+ct+thermostat+troubleshootin
    • http://files.drsamanthonyskin.com/uploads/1/3/1/3/131383514/bajepenitaxe.pdf
    • http://files.familychildcareassoc.com/uploads/1/3/1/3/131380008/zesarofesetome.pdf
    • http://files.handyvillage.com/uploads/1/3/1/4/131483662/39067632e9f7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5964/1496/files/bullers_wood_sixth_form_contact.pdf
    • https://cdn.shopify.com/s/files/1/0431/8294/8506/files/dasijananusanurasuzuwogez.pdf
    • https://cdn.shopify.com/s/files/1/0431/1682/2692/files/47276353323.pdf
    • https://cdn.shopify.com/s/files/1/0451/1848/8741/files/linux_nano_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/8001/5262/files/roniwaxiru.pdf
    • https://cdn.shopify.com/s/files/1/0429/7129/9999/files/numerologia_angelical.pdf
    • https://cdn.shopify.com/s/files/1/0432/0726/2370/files/acetato_de_sodio_usos.pdf
    • https://cdn.shopify.com/s/files/1/0453/9963/8184/files/jetewu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98223768302.pdf
    • https://cdn.shopify.com/s/files/1/0433/0553/3598/files/ooredoo_tv_user_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/2280/3366/files/rosilanawaluwes.pdf
    • https://cdn.shopify.com/s/files/1/0434/1514/2567/files/ragnarok_battle_offline.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_off00006988.bin
035d44f2f08e802801b4993eaf09b284ec8c614b1eec2059e70d9e8b492bc552
pdf-font-stream PDF embedded font (sfnt) at offset 0x6988 5180 bytes
font_01_sfnt_off00007afb.bin
4193a5be0e5a4227413bdb8a78370d556657b066956dc798bbfaddefbb701e4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AFB 9664 bytes