Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b51d1520ab3cc82…

MALICIOUS

PDF

37.4 KB Created: 2020-09-01 02:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bea8309391bbf46e931102e9464cbed SHA-1: 695997de98a92c1f3ad6d6f1955eeceb86d04dc5 SHA-256: 5b51d1520ab3cc821bf325ba152b9dd679ad79c03a998a84e4f60afb1e5769e4
174 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://ttraff.ru/wix?keyword=adj+sheet+metal+jobs, is flagged as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm or SEO abuse. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam context, further supported by the presence of URLs in the document body. No scripts were extracted, but the overall pattern points to a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=adj+sheet+metal+jobs
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_b023001898134fe8b6c924ffb909eb18.pdf
    • https://static.usrfiles.com/ugd/64f9d2_fcc51d13697d4385b5bbce39384f513e.pdf
    • https://static.usrfiles.com/ugd/9edd50_28ea98f6ad8746cb92bcb5f1141a04a9.pdf
    • https://static.usrfiles.com/ugd/89363e_c15a8095c7684b46be1575afff4d23a4.pdf
    • https://static.usrfiles.com/ugd/b8c837_23a055ba82364faa9aee6e7df11a00e8.pdf
    • https://static.usrfiles.com/ugd/b8c837_576b572585034db998e9fea34c285dc0.pdf
    • https://static.usrfiles.com/ugd/b8c837_fffc3add1a194ecb8ad92f23bd26b7d5.pdf
    • https://static.usrfiles.com/ugd/63022f_92fc26cd621c4fdbaebe8283a399d23a.pdf
    • https://static.usrfiles.com/ugd/eb4c03_20ea44ba09ec4875bf04e2f40ac9444c.pdf
    • https://static.usrfiles.com/ugd/7603ae_1cf7b8b725f54a808b36706aba201775.pdf
    • https://static.usrfiles.com/ugd/76de1a_2142a1cd79224904b58f2ac4ff962ab0.pdf
    • https://static.usrfiles.com/ugd/b8c837_dc3a4bf614a94e6e851c34e062a6ec3f.pdf
    • https://static.usrfiles.com/ugd/73cb9e_8a736c2f64694eb4994223e9dca0be0f.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_off00005612.bin
6c185b59eb6b18f2a1ac36b8e6109cc4035f9183506c23ab642feef10d95f290		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5612 5176 bytes
font_01_sfnt_off00006786.bin
c475025ea15fe229f0f1484b022f74eafd63508e7c47b25bd82364076c489b78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6786 9948 bytes

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