Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d94a875559c0cda…

MALICIOUS

PDF

47.1 KB Created: 2020-08-21 12:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee476967726c50154a4088993f12a02f SHA-1: 659c87d534aebbe3679db0a105d23bf00e65a437 SHA-256: 7d94a875559c0cda61f29c9d03dbdd00c9278b95106e0f7ebd32a7752d499dc8
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 Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=flyer+template+free++word', suggesting a lure to download or view content. The ML classifier strongly flagged this PDF as malicious, and the presence of a malicious redirector indicates an attempt to lead the user to a malicious site.

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.cc/pify?keyword=flyer+template+free++word
    • http://webed.moodyplumbinginc.com/uploads/1/3/1/4/131438044/3458667.pdf
    • http://nisin.creativeartsguildmi.org/uploads/1/3/1/4/131407089/7798883.pdf
    • http://files.lisafinn.net/uploads/1/3/1/8/131856491/1349948.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8415/2986/files/2010_chevy_malibu_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/3600/8870/files/87826952993.pdf
    • https://cdn.shopify.com/s/files/1/0432/2738/1924/files/93029030428.pdf
    • https://cdn.shopify.com/s/files/1/0435/5876/4696/files/samsung_galaxy_s10_user_manual_download.pdf
    • https://cdn.shopify.com/s/files/1/0447/0325/2636/files/tazenanav.pdf
    • https://cdn.shopify.com/s/files/1/0439/7917/8142/files/puxokikebu.pdf
    • https://cdn.shopify.com/s/files/1/0440/8272/5029/files/kufadiralo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5572/6238/files/jarijufazo.pdf
    • https://cdn.shopify.com/s/files/1/0436/4166/7734/files/anestesia_epidural_efectos_secundarios.pdf
    • https://cdn.shopify.com/s/files/1/0431/5653/7493/files/mujumelujiworeli.pdf
    • https://cdn.shopify.com/s/files/1/0427/6197/8023/files/73998192905.pdf
    • https://cdn.shopify.com/s/files/1/0434/9899/5864/files/18088693072.pdf
    • https://cdn.shopify.com/s/files/1/0435/3835/0231/files/staff_attendance_management_system.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_off00007a9c.bin
c5e36a4ea06310bb52ddd508b5bce4e864f29635380d6316ae38cd9f121dfeec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A9C 5156 bytes
font_01_sfnt_off00008c2e.bin
131c9efac628eb13eb086dbb876d975626a4d56c18585f38fd5dfdcf2b5b4209		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C2E 10400 bytes

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