Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8297a3025d8f424…

MALICIOUS

PDF

41.2 KB Created: 2020-08-29 04:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb10462f95bce7617a5aac1ce02ca684 SHA-1: e8c7a48cb38ab2c53e7f8142c895bf48cff35e10 SHA-256: a8297a3025d8f4245d3d853532f7e5f759657bb5019f8e6dbc1d810efd2ad4be
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised as a search result for 'this war of mine emilia'. This indicates a phishing or malware distribution attempt. The PDF also features a large number of external links, many pointing to static.usrfiles.com, suggesting a link farm or SEO poisoning tactic to improve search engine ranking for malicious content. No scripts were extracted, but the primary malicious activity appears to be the redirection to the 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.cc/wix?keyword=this+war+of+mine+emilia
    • https://static.usrfiles.com/ugd/b8c837_c9560792eea749edb5500466834619e7.pdf
    • https://static.usrfiles.com/ugd/b8c837_b1c18537395544b990b7f884db664f53.pdf
    • https://static.usrfiles.com/ugd/b8c837_a973b37b504147cd9253f887e3dad7d3.pdf
    • https://static.usrfiles.com/ugd/b8c837_3d7decd2b1cc4cf390df266a4601fc14.pdf
    • https://static.usrfiles.com/ugd/b8c837_2e5f2ae6fe21450eb02d597a6e29cb83.pdf
    • https://cdn.shopify.com/s/files/1/0434/6917/6992/files/dopujawogafirisipawi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7229/8913/files/that_s_a_christmas_to_me_mbmbam.pdf
    • https://static.usrfiles.com/ugd/b8c837_5cf9f4b5e50c407bb75fc8dc116f831f.pdf
    • https://static.usrfiles.com/ugd/b8c837_be614cb940534a99ba493049139c3711.pdf
    • https://static.usrfiles.com/ugd/b8c837_b110cfcaee064105be01a87234f9ce4e.pdf
    • https://static.usrfiles.com/ugd/b8c837_3d3eb8c9cf294477bd1a2e232c109eff.pdf
    • https://static.usrfiles.com/ugd/b8c837_4700affa9b294b6ab96056e667ff6845.pdf
    • https://static.usrfiles.com/ugd/b8c837_015a73c995244b06aa1f950515001515.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_off00006455.bin
726ee52307dcf4c9d164c380d3622d86447e39947b900a46a9e86bb1814aa82c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6455 5048 bytes
font_01_sfnt_off0000756a.bin
3d402d4f35bae0022a2b88a43bfd693b972176dcae5c387a0a08717347a72513
pdf-font-stream PDF embedded font (sfnt) at offset 0x756A 10264 bytes