Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c40c36b1712b7a8…

MALICIOUS

PDF

49.7 KB Created: 2020-08-30 12:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f09851d1b5cff9df7babf306f206dbf5 SHA-1: ad09f2e9a7a4d2f8c0edbc3d58ba324fa15d47a8 SHA-256: 9c40c36b1712b7a8972a0e38b4389ed4a75451352722e9aace684786b90e172c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious URL, 'https://ttraff.com/wix?keyword=light+domain+cleric', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be largely obfuscated or contains minimal readable content, but the presence of numerous links points towards a link-farming or redirection-based attack. No scripts were extracted from this sample.

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/wix?keyword=light+domain+cleric
    • https://static.usrfiles.com/ugd/b8c837_74d49489ccae40119cda99f384d04bb7.pdf
    • https://static.usrfiles.com/ugd/8acad3_5053eae0c5fa4903855aec3171364522.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_e0b212d9a21740cfa80d6b036fd20073.pdf
    • https://static.usrfiles.com/ugd/e2b09b_fb327b8694a5400bbba255f6ab016f3e.pdf
    • https://static.usrfiles.com/ugd/b7082a_e0ffc438f05f4ed89cf1b4685b26f468.pdf
    • https://cdn.shopify.com/s/files/1/0439/1629/6360/files/arithmetic_mean_and_geometric_mean_problems.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/togodaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/5136/0164/files/lifesiwi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7098/8196/files/36684253371.pdf
    • https://cdn.shopify.com/s/files/1/0434/6570/3590/files/kemosuniloxogu.pdf
    • https://cdn.shopify.com/s/files/1/0437/0454/9544/files/tifr_question_papers_physics_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/7623/1063/files/47041942521.pdf
    • https://cdn.shopify.com/s/files/1/0433/0972/7912/files/vixirovimaxagajevesir.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_off00008560.bin
bd2ebd5267460d29288741a66fc3a16f5343589d3737565ed5ac55838e60f56b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8560 5116 bytes
font_01_sfnt_off0000969c.bin
c30984c06391b0a1a3347da1ddb5bc2274dc1b2012417829c0f5e4bf6ac99923
pdf-font-stream PDF embedded font (sfnt) at offset 0x969C 10500 bytes