Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f1ebd21bd5b2722…

MALICIOUS

PDF

78.9 KB Created: 2020-08-03 12:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15f137a6697f438c463bff054e0e90d1 SHA-1: 33a8ba91f98df98f140c2bca1ad6aaadfc80b5e8 SHA-256: 5f1ebd21bd5b2722dc6ef6b8e7c1f45ea4cbf889273d278b27ce5b5cceec7d1a
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 hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely the primary malicious payload delivery mechanism. The document body, though heavily obfuscated, contains the URL that triggered the redirector heuristic.

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=polarity+of+solvents+pdf
    • http://files.abilitynetwork.org/uploads/1/3/0/9/130969489/rumuzovirubupolum.pdf
    • http://files.marengofc.com/uploads/1/3/2/7/132740584/1492302.pdf
    • http://files.artinfluxlondon.com/uploads/1/3/1/1/131164479/wexokesajur_zukewusilipam.pdf
    • http://files.yamihymelphotography.com/uploads/1/3/2/6/132681625/jobimujox.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4211/0625/files/rekuwesitev.pdf
    • https://cdn.shopify.com/s/files/1/0435/2920/7957/files/wevovibog.pdf
    • https://cdn.shopify.com/s/files/1/0439/2583/1835/files/97835314497.pdf
    • https://cdn.shopify.com/s/files/1/0432/9940/5979/files/rezekorunigegufetugobalo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2761/1300/files/13960065365.pdf
    • https://cdn.shopify.com/s/files/1/0427/4287/4278/files/gikerit.pdf
    • https://cdn.shopify.com/s/files/1/0433/4921/3349/files/smiley_face_sticker.pdf
    • https://cdn.shopify.com/s/files/1/0432/6513/0660/files/53924427718.pdf
    • https://cdn.shopify.com/s/files/1/0431/7852/4832/files/89288513227.pdf
    • https://cdn.shopify.com/s/files/1/0433/9322/0775/files/zifoduzakuvukuxepofebet.pdf
    • https://cdn.shopify.com/s/files/1/0432/2361/3595/files/budigo.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8cc.bin
cf6bcbaf462759e04676f8989e7e87ed4d43c4317550ddbd0c5684ab0bd17b73		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CC 6492 bytes
font_01_sfnt_off0000e900.bin
e20a611a657110d9e480452ad1a20692eacd0558e95fa1f3477a76c3bee6c112		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE900 5196 bytes
font_02_sfnt_off0000fad0.bin
1fab629e220d95cbc21a7f5071cc9a10ab77ace4bf1ba1fea9ef74081ea7129e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD0 16156 bytes

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