Malicious PDF — malware analysis report

Static analysis result for SHA-256 664a795e9511ec22…

MALICIOUS

PDF

40.3 KB Created: 2020-08-04 10:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0692147c1eaa0700eb13af506b05fa6 SHA-1: 35644b3ec2ed0bd05369e8d425102294ddd4344d SHA-256: 664a795e9511ec22dc905a15498e6eebbad4f4503f5bdf79a62d48f5544ffc4f
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to a link farm infrastructure designed to redirect users to potentially malicious sites. The primary malicious URL identified is https://ttraff.ru/pify?keyword=anatomy+of+heart+pdf+book, which is flagged as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to lead the user to malicious content, likely for phishing or malware distribution.

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.ru/pify?keyword=anatomy+of+heart+pdf+book
    • http://files.cemmethod.net/uploads/1/3/2/6/132696249/niwipun.pdf
    • http://files.fentonbehavioralhealthservices.com/uploads/1/3/0/9/130969888/ramujuwegiguzajeji.pdf
    • http://files.fscmadison.org/uploads/1/3/1/4/131438456/sivunes_ziwaxigodopi_fazejusa_nivaramoperadeg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/muzoguganava.pdf
    • https://cdn.shopify.com/s/files/1/0436/1358/5566/files/xibasurakekufexadol.pdf
    • https://cdn.shopify.com/s/files/1/0435/3032/2084/files/6073429283.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/gaxukexekusoge.pdf
    • https://cdn.shopify.com/s/files/1/0434/3490/1660/files/88343772341.pdf
    • https://cdn.shopify.com/s/files/1/0434/0767/1447/files/42813342403.pdf
    • https://cdn.shopify.com/s/files/1/0435/7819/6129/files/30580900778.pdf
    • https://cdn.shopify.com/s/files/1/0436/5864/1573/files/kabubarapilem.pdf
    • https://cdn.shopify.com/s/files/1/0427/9848/1564/files/33554589752.pdf
    • https://cdn.shopify.com/s/files/1/0432/3799/8754/files/nefovojawajaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/4950/8246/files/ziwigedipoxovekesogex.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_off0000601b.bin
d06cd7d664eccf4891c507966efdc946ea30a04e00d7f2823a1edb17c4fc7a85
pdf-font-stream PDF embedded font (sfnt) at offset 0x601B 5368 bytes
font_01_sfnt_off00007239.bin
58ca62d6fac07257781870c77431687ff4cac8bcdbf07998c759f7e110969ef6
pdf-font-stream PDF embedded font (sfnt) at offset 0x7239 10092 bytes