Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b27eef6baa25123…

MALICIOUS

PDF

40.8 KB Created: 2020-08-29 04:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e59ed68544b10d799de7e5fb13a0a543 SHA-1: 19f017f36cd765491803f4037fcf741df0346c11 SHA-256: 5b27eef6baa25123d1c3ecf15bb3411cbcea75c5b4ca7f41b8d302b3e9c5f8f8
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://ttraff.com/wix?keyword=earth+science+final+exam+study+guide, is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious infrastructure. The presence of numerous other PDF links, many pointing to static.usrfiles.com, indicates a potential link farm or SEO manipulation tactic. No scripts were extracted, but the overall structure and embedded links point to a phishing or redirection attempt.

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.com/wix?keyword=earth+science+final+exam+study+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_b4105a9085274f2aa15636327422548c.pdf
    • https://static.usrfiles.com/ugd/b8c837_d098e4fd11204f8c9526e8a3bd5f751b.pdf
    • https://static.usrfiles.com/ugd/b8c837_00acb062bfc543c6a9ca7e70d00cd482.pdf
    • https://static.usrfiles.com/ugd/b8c837_d2401dbab147461d859b36180dd7b474.pdf
    • https://static.usrfiles.com/ugd/b8c837_aa86e560b5d84967a8f05fbf899b2897.pdf
    • https://static.usrfiles.com/ugd/b8c837_de3e9c0abc454b37a3094caa8c8210fa.pdf
    • https://static.usrfiles.com/ugd/b8c837_40722fb096944740834fc8603b10f9a3.pdf
    • https://static.usrfiles.com/ugd/b8c837_aafe7d4a9c8c49fa97a38022815f22f7.pdf
    • https://static.usrfiles.com/ugd/b8c837_89027fff57e94213849352ac165389d1.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9842a2897bf4bdc9bb74fe7f8ce7dda.pdf
    • https://static.usrfiles.com/ugd/b8c837_1dd09bc89bd343a8a43b9f89f3d7af1f.pdf
    • https://static.usrfiles.com/ugd/b8c837_58e72965b70c4f628d11ef31b82863bd.pdf
    • https://static.usrfiles.com/ugd/b8c837_ef2bd8778cf849fd9c7f220d72f0503f.pdf
    • https://static.usrfiles.com/ugd/b8c837_a832a50151e8428ca01710cdf281340c.pdf
    • https://static.usrfiles.com/ugd/b8c837_d94b033543fd4ea18abc292643af1d68.pdf
    • https://static.usrfiles.com/ugd/b8c837_432cfe9ff0eb48fca92d68034e3bf6a2.pdf
    • https://static.usrfiles.com/ugd/b8c837_65973569031d47b687af180330fcd4eb.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_off0000616c.bin
00fd57df847ccde9002de123ebdd1034ed9daf109670aa5a468250a38eaaf93d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x616C 5564 bytes
font_01_sfnt_off0000743a.bin
e7fd1b2093020f15cc6e7e2098ddc33489823ded8d95e19a54386fedc52da917		 pdf-font-stream PDF embedded font (sfnt) at offset 0x743A 9884 bytes

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