Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fa75e69c9d8944d…

MALICIOUS

PDF

41.4 KB Created: 2020-08-26 10:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75378d1cabb49d812ce71422b4fb4460 SHA-1: c55653732f19bf1380d92426b3833dab43c30eed SHA-256: 0fa75e69c9d8944d64b64d4ef39dc280a5adbb9a3366ad3ceb150633d7bce43e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure related to a crossword clue, which redirects to a malicious URL. This URL is part of a link farm containing numerous other PDF documents, suggesting a tactic to distribute malicious content or engage in SEO manipulation for malicious purposes. The ML classifier strongly indicates 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.com/pify?keyword=the+curse+of+capistrano+hero+crossword+clue
    • http://files.techreviewed.xyz/uploads/1/3/2/7/132712615/5446523.pdf
    • http://files.umichfishing.com/uploads/1/3/0/7/130775746/c0503694189e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/1256/1819/files/types_of_hedging_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0438/4669/7125/files/amharic_reporter_newspaper.pdf
    • https://cdn.shopify.com/s/files/1/0428/2961/1171/files/76566424116.pdf
    • https://cdn.shopify.com/s/files/1/0434/8982/0836/files/probability_equations.pdf
    • https://cdn.shopify.com/s/files/1/0433/8096/5534/files/81722840737.pdf
    • https://cdn.shopify.com/s/files/1/0459/6288/7335/files/32875573467.pdf
    • https://cdn.shopify.com/s/files/1/0437/0097/7816/files/shoulder_muscles_anatomy.pdf
    • https://cdn.shopify.com/s/files/1/0440/2656/0677/files/search_a_document_for_a_word.pdf
    • https://cdn.shopify.com/s/files/1/0427/7246/3772/files/aeronautical_sectional_charts.pdf
    • https://cdn.shopify.com/s/files/1/0429/1356/2787/files/dewolubug.pdf
    • https://cdn.shopify.com/s/files/1/0440/4540/2277/files/54636557727.pdf
    • https://cdn.shopify.com/s/files/1/0464/8389/8520/files/been_love_memory_plus_apk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000562b.bin
62daa638230ddacae934346044bc8322a735cb83b3e7907cd1c4953e92455b46
pdf-font-stream PDF embedded font (sfnt) at offset 0x562B 5164 bytes
font_01_sfnt_off000067c5.bin
032f283c7de4f3b62b51540c110327e9cbc4b4a1665c987e8d68d0e3c443b720
pdf-font-stream PDF embedded font (sfnt) at offset 0x67C5 10184 bytes
font_02_sfnt_off00008aa4.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x8AA4 4324 bytes