Malicious PDF — malware analysis report

Static analysis result for SHA-256 f727694c35aa670b…

MALICIOUS

PDF

45.8 KB Created: 2020-08-14 10:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38291f95576d775e751884d87be97e85 SHA-1: c438116389dc9aa5b27261190a7423b312e57a5f SHA-256: f727694c35aa670ba4050d7708e968fd6573a26534b6edb08c433c49ae3084c5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.ru'. This suggests a link farm or SEO poisoning tactic designed to funnel users to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body is heavily obfuscated, making it difficult to determine the exact lure beyond the presence of the malicious link.

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=angular+formarray+custom+validation
    • http://zumawitav.vibrafemeninaart.com/uploads/1/3/1/4/131406798/65f4f36b.pdf
    • http://files.scottiesrottiesofwny.com/uploads/1/3/1/3/131384301/solisoke.pdf
    • http://files.sycamorespringfarm.org/uploads/1/3/1/4/131437956/posunif.pdf
    • https://cdn.shopify.com/s/files/1/0440/4133/9045/files/53856871644.pdf
    • https://cdn.shopify.com/s/files/1/0427/5775/0951/files/34103672247.pdf
    • https://cdn.shopify.com/s/files/1/0450/0317/8148/files/bragg_s_law_notes.pdf
    • https://cdn.shopify.com/s/files/1/0435/5912/5160/files/12467120326.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0810/files/jet_boy_jet_girl_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nubizasijimowedemo.pdf
    • https://cdn.shopify.com/s/files/1/0429/0838/5439/files/tiputudujakusuwu.pdf
    • https://cdn.shopify.com/s/files/1/0439/0299/2536/files/jumusozavemitibigu.pdf
    • https://cdn.shopify.com/s/files/1/0439/2802/7304/files/le_bucoliche_di_virgilio.pdf
    • https://cdn.shopify.com/s/files/1/0431/1603/6262/files/xesogazulezosazipiluw.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_off0000681c.bin
7a72181bcce808e90f517e078db337d65e3f20586e771c5cd5cf9b78bcd214f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x681C 5492 bytes
font_01_sfnt_off00007ac1.bin
92800972e7367d93f66a4835970894395d1d3052c4b43b4e2ac971b0e6fbda9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AC1 14768 bytes