Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f510cf99ea32626…

MALICIOUS

PDF

50.6 KB Created: 2020-08-29 09:39:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7490c53e45878d4e11f25b072b66793f SHA-1: 973557d34bb91d6664005b0f37e868d6f3502c62 SHA-256: 6f510cf99ea3262677d3b42d64fc83b22f6ec296156fb786a325398376bfff3a
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector URL, indicating an attempt to drive traffic to malicious infrastructure. The document body, though heavily obfuscated, contains keywords that align with the redirector URL's query parameters, suggesting a lure. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence point to malicious intent.

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=adult+bookstore+charlotte+nc
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_559675a73b904d7ba612f4eb3e05f2b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_5f7122a0f76846b5979b588cb5287a24.pdf
    • https://static.usrfiles.com/ugd/b8c837_fd75f13c0f4448adbdfa0cc5f547db8a.pdf
    • https://static.usrfiles.com/ugd/b8c837_10c1e30c387c4652b6ae08ff1d62f979.pdf
    • https://static.usrfiles.com/ugd/b8c837_304b6f131d7c41909e8048a29c1e6c37.pdf
    • https://static.usrfiles.com/ugd/b8c837_b34d500d95844267aa7a0fb2f1b9653a.pdf
    • https://static.usrfiles.com/ugd/b8c837_b79a4ddfceea4674a0209aaea407c7b6.pdf
    • https://static.usrfiles.com/ugd/b8c837_10a7e12eff0d436aa51fe9fcc597d09e.pdf
    • https://static.usrfiles.com/ugd/b8c837_f8f5da4104c14252bd22190d61d8cc19.pdf
    • https://static.usrfiles.com/ugd/b8c837_5a0427ae06494434b9176ab59d5989b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_b49899ea6ce24531be5abbcbe765ce65.pdf
    • https://static.usrfiles.com/ugd/b8c837_92bea7a586fd4e00a08e629d2fab10a1.pdf
    • https://static.usrfiles.com/ugd/b8c837_47248dd6f0a14672b265e6081293c3cb.pdf
    • https://static.usrfiles.com/ugd/b8c837_8cf3b0b71b3d427f87cd7294520a3692.pdf
    • https://static.usrfiles.com/ugd/b8c837_69448f931abd48f8b1328e491304ecdb.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_off00008755.bin
c3b49c326d68ed7752d8054989a0b6088d053db5def504cd306ba80f2094db11
pdf-font-stream PDF embedded font (sfnt) at offset 0x8755 5220 bytes
font_01_sfnt_off00009902.bin
df3c9d4a7651edf30f9124c5a94a6bec9e96b8e1450cbecae633d886d459e2b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x9902 10728 bytes