Malicious PDF — malware analysis report

Static analysis result for SHA-256 1655914cc5bad3c1…

MALICIOUS

PDF

57.8 KB Created: 2020-09-01 04:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ef8bb10acf992b1567766f31066ac23 SHA-1: 31320f4cf084aec793fe53de73b8edaab83af44a SHA-256: 1655914cc5bad3c18e7a1a3010826f9d0488ce22fd42ebfad7d2009de47a62b4
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically a URL designed to lure users with a 'sample resume format for marriage proposal' keyword. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and the ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to a malicious site, likely for phishing or malware distribution.

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.ru/wix?keyword=sample+resume+format+for+marriage+proposal
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_0dbe673e0fad465ca3f6a0cec99cd676.pdf
    • https://static.usrfiles.com/ugd/b8c837_8f125fccc3ae4256ac7835c55a89af43.pdf
    • https://static.usrfiles.com/ugd/b8c837_8c0452be10fc494bbbe4d85771ffaf5d.pdf
    • https://static.usrfiles.com/ugd/6c032c_a4f8615757d941578e5ec26391af4452.pdf
    • https://static.usrfiles.com/ugd/3ceeb9_029957eb30e8401496d7896eab54abce.pdf
    • https://static.usrfiles.com/ugd/804ff6_2f8c25cc27a84e8ca65cb4373f2432fa.pdf
    • https://static.usrfiles.com/ugd/24853a_27469fdf999a4795a1a17bc67ee42a9b.pdf
    • https://static.usrfiles.com/ugd/b98abb_e71e93339c95426ba8fb10c52675130a.pdf
    • https://static.usrfiles.com/ugd/0b46e6_54f7b18148104679b1582d9da72646a9.pdf
    • https://static.usrfiles.com/ugd/21e6f2_951f04cbca1a49c5b114580476afa668.pdf
    • https://static.usrfiles.com/ugd/c1615c_580d59a2efb94ad1a4bd0b1aac0eec45.pdf
    • https://static.usrfiles.com/ugd/3ce946_8e95b14af8ee4af0b1bc0ec7acfc9a3b.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a4b3.bin
45942fac0dd762a3351269dabae32c12bd85a7bdbe2067ed69bd020b9908fa51
pdf-font-stream PDF embedded font (sfnt) at offset 0xA4B3 5324 bytes
font_01_sfnt_off0000b6b6.bin
c3e8a07e2cd0cdb0fb699499c22898270d382d3c7d9a4d3c2f9079385f7a2715
pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B6 10288 bytes