Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f532192e52aa87b…

MALICIOUS

PDF

41.0 KB Created: 2020-08-24 12:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1fe2dec97d8b35da517f348b63576b3 SHA-1: e49eabbb8280a3fe1b57c5bddb167abd1351908d SHA-256: 6f532192e52aa87bbbbe53fe98eab70d4d3b0cd6fa8b51ecdda7ac48eac9a42d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, likely as a SEO link farm. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=codswallop+crossword+answer'. This suggests the document is designed to funnel users through malicious sites, potentially for further exploitation or phishing. No scripts were extracted, and the document body was heavily obfuscated.

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.com/pify?keyword=codswallop+crossword+answer
    • http://files.unionists.org/uploads/1/3/0/7/130739971/2068778.pdf
    • http://files.catherinecarterphotography.co.uk/uploads/1/3/1/4/131405977/selikivutanu.pdf
    • http://vesafinap.nyctutor4kids.com/uploads/1/3/1/8/131871780/e3493.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2718/5309/files/72842645167.pdf
    • https://cdn.shopify.com/s/files/1/0434/2307/2412/files/288373350.pdf
    • https://cdn.shopify.com/s/files/1/0435/3028/9311/files/workability_of_concrete_by_compaction_factor_test.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/kibuzowajejibiduxipenemuj.pdf
    • https://cdn.shopify.com/s/files/1/0431/7747/6253/files/33040165104.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/radipununutewubamojam.pdf
    • https://cdn.shopify.com/s/files/1/0433/9400/7201/files/93394025069.pdf
    • https://cdn.shopify.com/s/files/1/0437/5530/7159/files/93514209051.pdf
    • https://cdn.shopify.com/s/files/1/0430/1104/7575/files/47529635828.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_off000056a2.bin
355fdf6b284a99b36866f3353998a0f406fb19434116434c29a4f5e775cb59ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x56A2 5064 bytes
font_01_sfnt_off000067fc.bin
a63eaa237b1277d1611e2150f6be07377b032c746146c51c1398748908a7c5f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x67FC 15276 bytes