Malicious PDF — malware analysis report

Static analysis result for SHA-256 b13a9ffb607b6704…

MALICIOUS

PDF

44.3 KB Created: 2020-08-30 02:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1acb9ed48df3e0ca1ce56d567118988 SHA-1: ae5791293d8860dded167868e592a6d2d35f257a SHA-256: b13a9ffb607b67045fd8e28738e5361c8db864fe2e8cdacfef2ebf20d7b1a3d9
152 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to a malicious domain, disguised as a music album download. This is further supported by heuristics indicating a malicious redirector link and a link farm, suggesting an attempt to drive traffic to potentially harmful sites. The ML classifier also strongly indicated 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.me/wix?keyword=g+dragon+one+of+a+kind+album+download+mp3
    • https://static.usrfiles.com/ugd/b8c837_5271f685e4c645d1990d647885469eec.pdf
    • https://static.usrfiles.com/ugd/3fc21f_947b56e8a1d14154b8c4920ae5665893.pdf
    • https://static.usrfiles.com/ugd/735189_d7268a1c33cb41e8a0238ed6d0710d34.pdf
    • https://static.usrfiles.com/ugd/b8c837_a4ad87bbb5ac45b1b7a6d1efa8027d16.pdf
    • https://static.usrfiles.com/ugd/b8c837_f20fde12943f47099338d386a33b78d0.pdf
    • https://cdn.shopify.com/s/files/1/0428/6559/0438/files/30540590197.pdf
    • https://cdn.shopify.com/s/files/1/0431/5407/9910/files/98697552157.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/oliguria_concepto.pdf
    • https://cdn.shopify.com/s/files/1/0428/9229/6359/files/55711919340.pdf
    • https://static.usrfiles.com/ugd/b58d21_938eb2e87b574054aec7a27ea0ace2da.pdf
    • https://static.usrfiles.com/ugd/3b47cb_90e6b9d64fa447769bd6b263700a487f.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd4241b57a8d4823a858e18bfd4f8e52.pdf
    • https://static.usrfiles.com/ugd/21e6f2_e81329ca3943447e81754a46974c9efd.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f1c85de66dd4687b694c5f26e3a0ccd.pdf
    • https://cdn.shopify.com/s/files/1/0436/8669/0969/files/exponent_rules_practice_problems_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0438/5603/5990/files/77481376404.pdf
    • https://cdn.shopify.com/s/files/1/0432/2007/4657/files/power_amplifier_classification.pdf
    • https://cdn.shopify.com/s/files/1/0439/9579/1518/files/functional_resume_example.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_off000052fd.bin
16fe3580f643287cdb09ca658613b1c1181250a2be922171f1abdd1766c2b910		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52FD 7348 bytes
font_01_sfnt_off00006b44.bin
35bb3a436670f303fd6c7fe570ec16c267bcbe9121942b8364b5bdc0cfc98730		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B44 5676 bytes
font_02_sfnt_off00007e9d.bin
c689f21ea6ff3b39b5c08cc21017b70e1433855ef19809dc7b041911783e9ea1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E9D 10984 bytes

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