Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fb78ed512c9aeaa…

MALICIOUS

PDF

35.6 KB Created: 2020-08-20 05:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e4dc76b83b9a559767363b3f1f182b1 SHA-1: d373e4c42b0f7a756858d4ced703c7da92f3f464 SHA-256: 7fb78ed512c9aeaa2f2fdcafbf34f5b6f49a4c77345444750052085baef9597e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell 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 attack designed to funnel users to malicious content. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, limiting the analysis of direct payload delivery.

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=composite+functions+worksheet+algebra+1
    • http://files.mhcs.me/uploads/1/3/0/7/130775652/fonuwidumajovuxa.pdf
    • http://files.jhwelchdesigns.com/uploads/1/3/1/3/131398019/a211b22.pdf
    • http://risef.funseekersrebel.com/uploads/1/3/1/8/131856318/rovigiwej_wasawonodidi.pdf
    • http://files.orchardavepta.org/uploads/1/3/1/4/131452804/9878838.pdf
    • https://cdn.shopify.com/s/files/1/0437/3485/9941/files/50168762460.pdf
    • https://cdn.shopify.com/s/files/1/0429/6962/8828/files/xanathar_s_guide_to_everything_races.pdf
    • https://cdn.shopify.com/s/files/1/0432/5713/5257/files/bejepababejolata.pdf
    • https://cdn.shopify.com/s/files/1/0437/7791/7085/files/neural_network_algorithm.pdf
    • https://cdn.shopify.com/s/files/1/0434/1553/5774/files/awakened_empath_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/9901/2766/files/cuisine_algrienne_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0433/9616/9886/files/16681687047.pdf
    • https://cdn.shopify.com/s/files/1/0433/0802/3966/files/nonprofit_bookkeeping_and_accounting_for_dummies.pdf
    • https://cdn.shopify.com/s/files/1/0433/8538/9206/files/67967907641.pdf
    • https://cdn.shopify.com/s/files/1/0435/7275/6648/files/mapa_carreteras_castilla_leon.pdf
    • https://cdn.shopify.com/s/files/1/0428/5349/9046/files/vizezobinefukifapizalabaj.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_off00004c2c.bin
0ac3aab16b99431a256145b3173d51f2e8ed6a65520d79170c2a9b91e196cc88
pdf-font-stream PDF embedded font (sfnt) at offset 0x4C2C 5680 bytes
font_01_sfnt_off00005f72.bin
e151d7ef4a406858f1ed1d7a6a27cfd1469533e48682df21c9f6848a243bb401
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F72 9560 bytes