Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a3f69f1f6a646f4…

MALICIOUS

PDF

46.8 KB Created: 2020-08-30 07:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bca4589dfae296fd0d5f6b1da6ffc5eb SHA-1: 5ad6de9b6fd13dc664ed1dfcac9828524cf53f18 SHA-256: 0a3f69f1f6a646f45afcbcdc662d7067f256ce20211653675b2d787854c3a023
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to Shopify and other benign-looking domains, but one critical URL redirects to a known malicious infrastructure. This suggests a link farm or SEO poisoning tactic designed to trick users into visiting malicious sites. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=les+choristes+full+movie+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5396/4702/files/hanuman_chalisa_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0702/5060/files/letozabugimiridoxew.pdf
    • https://cdn.shopify.com/s/files/1/0431/7020/1760/files/ccna_security_lab_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/5117/1478/files/33682368725.pdf
    • https://cdn.shopify.com/s/files/1/0437/6385/9605/files/fumirijivuzugugowaparoka.pdf
    • https://cdn.shopify.com/s/files/1/0439/1187/2667/files/6564350551.pdf
    • https://static.usrfiles.com/ugd/b8c837_fc27ce32656a45dab40b55f2f0df6456.pdf
    • https://static.usrfiles.com/ugd/a48928_2a5607929ec748b99153dae027cd6834.pdf
    • https://static.usrfiles.com/ugd/41a0b6_423e22190550401a87c6c0c07b045e57.pdf
    • https://static.usrfiles.com/ugd/d4a9d6_9177cded59654f14add2f5df7cea3e71.pdf
    • https://static.usrfiles.com/ugd/e745be_11090e681823481ca8de9e07ebd734a1.pdf
    • https://static.usrfiles.com/ugd/b8c837_3d1bd5baa19547078d6a8cbcd280e828.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_off00007927.bin
1eb5c03be886fde448b4402f77d2400f9228e4e93866456f582aa0b192356200
pdf-font-stream PDF embedded font (sfnt) at offset 0x7927 4912 bytes
font_01_sfnt_off000089c4.bin
3700541b968f6a2dc90cd71fd3a7742e1e305d466d5485ab9079187aa170f081
pdf-font-stream PDF embedded font (sfnt) at offset 0x89C4 10860 bytes