Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8378cf2666ff90…

MALICIOUS

PDF

41.7 KB Created: 2020-08-06 03:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 260792450a3002d51fe638f05b2273d9 SHA-1: fc32dcecfb353e63c45ee960925ac0a83034a913 SHA-256: da8378cf2666ff903de2612bba15e4cdfc74acdddfb1b13ca5962bb15c610f45
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a malicious redirector link, specifically 'https://ttraff.cc/pify?keyword=cattell+iq+test+pdf', which is designed to lure users to potentially harmful websites. The document also features a large number of embedded links to other PDFs hosted on Shopify, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicated maliciousness, supporting the presence of these suspicious 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.cc/pify?keyword=cattell+iq+test+pdf
    • http://files.maternity-depot.net/uploads/1/3/0/8/130814423/980a52a5.pdf
    • http://tegonufar.coupadvantageportal.com/uploads/1/3/1/1/131163667/pujukipixolabif.pdf
    • http://bubat.mountainfresh.org/uploads/1/3/1/3/131379803/4539897.pdf
    • http://files.significanthealing.com/uploads/1/3/0/7/130739916/418075.pdf
    • http://files.alfatihainstitute.com/uploads/1/3/2/6/132681743/wavakekovu_pisozoji_tifojivo_bawokavukiti.pdf
    • https://cdn.shopify.com/s/files/1/0441/3823/4008/files/sodabikigepu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3351/files/46862545667.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sosivizugepu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/runuwadobona.pdf
    • https://cdn.shopify.com/s/files/1/0430/8025/3593/files/gebiweji.pdf
    • https://cdn.shopify.com/s/files/1/0438/3368/8226/files/avid_pro_tools_s3.pdf
    • https://cdn.shopify.com/s/files/1/0430/5249/9098/files/bugugibupilutapokejewe.pdf
    • https://cdn.shopify.com/s/files/1/0432/4520/7714/files/jalifajuwerigonik.pdf
    • https://cdn.shopify.com/s/files/1/0438/2470/9794/files/certificate_samples.pdf
    • https://cdn.shopify.com/s/files/1/0434/3427/9062/files/66064868480.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99324429390.pdf
    • https://cdn.shopify.com/s/files/1/0440/1384/6693/files/56391045576.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006621.bin
db8d50afebbd213c851a71a90573d78cf52265abfe042938f0b452c2b857ee99
pdf-font-stream PDF embedded font (sfnt) at offset 0x6621 4972 bytes
font_01_sfnt_off0000771b.bin
d1160b4f75e98d97863a00154bfcf0686e3aee17e11251b3110fe0dc6af5a70e
pdf-font-stream PDF embedded font (sfnt) at offset 0x771B 10324 bytes