Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e86c7e434793acc…

MALICIOUS

PDF

40.8 KB Created: 2020-08-31 16:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f24e67ab6d749ab382e06f0d78e1123 SHA-1: 045acbfdd36cb3766ad1599e45d92fa6d0b6a73c SHA-256: 6e86c7e434793accc2e8208306efec93b26f44afb7b65ca86c9b63ac3808892b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised as an answer key for 'crime and punishment'. The document also exhibits characteristics of a link farm, with numerous external PDF links, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier strongly indicates malicious intent.

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.cc/pify?keyword=islcollective+answer+key+crime+and+punishment
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_65a89d287a984481afab65a9a83a6242.pdf
    • https://static.usrfiles.com/ugd/81d6a4_d10ea119eaf349669d00ba2ed6b91077.pdf
    • https://static.usrfiles.com/ugd/ac72e0_ee76e4f1cfdd4ef8894a9475741c1dd7.pdf
    • https://static.usrfiles.com/ugd/ee6770_4cc584c9aa4a480c8216c6f26077cd48.pdf
    • https://static.usrfiles.com/ugd/b8c837_470c600901784a6480168fd239ba6a75.pdf
    • https://static.usrfiles.com/ugd/db93e9_a64c08569d434554bd3462feb969da90.pdf
    • https://static.usrfiles.com/ugd/b7306e_6f88911296eb47d8a31f50edd1ef9c2e.pdf
    • https://static.usrfiles.com/ugd/b8c837_2f46307689d54debacfec8c14670a98d.pdf
    • https://static.usrfiles.com/ugd/b8c837_bebec2d79e4a49c6bd4768229736433d.pdf
    • https://static.usrfiles.com/ugd/99965f_61b5b76687184b05af277246b72d7540.pdf
    • https://static.usrfiles.com/ugd/b8c837_9badf7fb0ffd40e79498412c81767ac0.pdf
    • https://cdn.shopify.com/s/files/1/0430/3591/8489/files/30690672557.pdf
    • https://cdn.shopify.com/s/files/1/0433/9639/9269/files/hubspot_academy_test_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/7675/5349/files/c_winforms_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0460/6781/0459/files/vejibokewabisixawazaw.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_off00005364.bin
cef65e0f899ec426d812e8af0a0cd14d3e10a0d6f073149164d31164f3a13591		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5364 5452 bytes
font_01_sfnt_off000065ca.bin
d0f38ca8d4cb9e2c06d1bcb7c8571f0ee5809f845f781f21c825b79d542439bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65CA 10036 bytes
font_02_sfnt_off000087ff.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87FF 4324 bytes

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