Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bff3ad0182dbdf5…

MALICIOUS

PDF

50.4 KB Created: 2020-09-14 21:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a24f68aac0ba198f8b1a91af31e9fd3 SHA-1: ac26fba9ad1cec782206b596b955fecdf73350b1 SHA-256: 6bff3ad0182dbdf54f7248375e3ae7c32030024e32444a0b8fd8eb1d8458a249
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded URLs that point to a redirector service, which is a common tactic for phishing or malware distribution. The ML classifier strongly indicated maliciousness, and the presence of a redirector link suggests an attempt to obscure the final malicious destination. No scripts were extracted, but the document body and heuristics indicate a lure to a malicious URL.

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.me/pify?keyword=the+norton+anthology+of+english+literature+volume+f+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/74a852_fa7ae8bf172941dbad989404c9de0f73.pdf
    • https://static.usrfiles.com/ugd/b8c837_470c600901784a6480168fd239ba6a75.pdf
    • https://static.usrfiles.com/ugd/ebc5f9_7fba44105b1c4eca93bfadf083e06794.pdf
    • https://static.usrfiles.com/ugd/b8c837_f6ba4b36a0154c989d0c4a13047bd913.pdf
    • https://static.usrfiles.com/ugd/0d9a50_6ce0d812b43e4d6ab2c01e6007609778.pdf
    • https://static.usrfiles.com/ugd/097bd5_8195278ffa5c4aa381f0fcbbe2f333b0.pdf
    • https://static.usrfiles.com/ugd/2e16aa_66832e2eff2c47ddb4faa54291a7c79e.pdf
    • https://static.usrfiles.com/ugd/8b61cf_642454e856094a7f99b6e57478557445.pdf
    • https://static.usrfiles.com/ugd/314c35_b1089f7dc08e4d32afdc7358e5dd0be5.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23535065851.pdf
    • https://cdn.shopify.com/s/files/1/0437/2476/7400/files/allstar_performance_power_steering_pump_kit.pdf
    • https://cdn.shopify.com/s/files/1/0440/5759/1960/files/85484050956.pdf
    • https://static.usrfiles.com/ugd/e2f7e1_393f4863e9984fb791f2d5489b800c8b.pdf
    • https://static.usrfiles.com/ugd/b8c837_a69288762fdd4d4e88a891d3cd457972.pdf
    • https://static.usrfiles.com/ugd/9ef1ea_1797d327126c4db39b13d4d960b41e24.pdf
    • https://static.usrfiles.com/ugd/5926b4_9e3f8335d63044c8813ac574a3fb74a3.pdf
    • https://static.usrfiles.com/ugd/98e298_68b8a41ca1a742c9b96c912637063508.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_off0000781e.bin
6980efa00bce25e2f7f624831e7ef4ae53a5e152a6dc77e73ce27c6b2e9c3259		 pdf-font-stream PDF embedded font (sfnt) at offset 0x781E 5448 bytes
font_01_sfnt_off00008a85.bin
f360fc002f1ef94d13cbe12855a8e818d383e436d6c83993143185f63268f9c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A85 10244 bytes
font_02_sfnt_off0000ad90.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD90 4324 bytes

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