Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c55a5099ba0b5c0…

MALICIOUS

PDF

44.9 KB Created: 2020-08-10 07:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1153bc5d2d764c1eb6fdbd1c3158cfa SHA-1: 92392bb37f65c150ef981b139b90267a7a1554e8 SHA-256: 8c55a5099ba0b5c092cbe28c971d31ad491032090c499d769f838652db11922e
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL and references 'accident and emergency pdf', suggesting a lure. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm designed to obscure the ultimate destination and potentially spread malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=accident+and+emergency+pdf
    • http://files.christinevilla.com/uploads/1/3/2/6/132681409/bemetesufugojejikem.pdf
    • http://files.desertjudoaz.com/uploads/1/3/2/6/132682739/lutevekatovevetenemu.pdf
    • http://files.lifespacedesigns.com/uploads/1/3/1/1/131164431/ledofenewolikimiku.pdf
    • http://files.tanyadann.co.nz/uploads/1/3/1/4/131406300/fopokodazupon.pdf
    • http://files.amsterdamclassictours.com/uploads/1/3/1/0/131070851/vemugebat_jokil_bonurotekewa_wunapa.pdf
    • https://cdn.shopify.com/s/files/1/0433/7264/2454/files/sample_abstract_reasoning_test_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7992/files/vavagimokiromasusimozabag.pdf
    • https://cdn.shopify.com/s/files/1/0428/3046/3142/files/dezupipe.pdf
    • https://cdn.shopify.com/s/files/1/0433/1310/2998/files/45169097307.pdf
    • https://cdn.shopify.com/s/files/1/0429/9754/7157/files/75914286336.pdf
    • https://cdn.shopify.com/s/files/1/0434/3139/5478/files/lepomatagazusugepozuri.pdf
    • https://cdn.shopify.com/s/files/1/0431/3242/0264/files/34730412957.pdf
    • https://cdn.shopify.com/s/files/1/0427/4218/6150/files/tovixex.pdf
    • https://cdn.shopify.com/s/files/1/0435/1354/4863/files/apopleja_hipofisaria.pdf
    • https://cdn.shopify.com/s/files/1/0434/6249/2310/files/email_writing_communication_skills.pdf
    • https://cdn.shopify.com/s/files/1/0431/4542/9160/files/40792620732.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066cd.bin
2dfcb11b92db685689bcfad74e0dd2ef3974092e73d95fc5773b0234e72d5678
pdf-font-stream PDF embedded font (sfnt) at offset 0x66CD 5036 bytes
font_01_sfnt_off000077ca.bin
8d29300811b610337857d21a4b4b1cf076b38e99136aa1dc68ef97da0539d89b
pdf-font-stream PDF embedded font (sfnt) at offset 0x77CA 9636 bytes
font_02_sfnt_off000098b0.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x98B0 4324 bytes