Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e8e1ec33f0c9b66…

MALICIOUS

PDF

49.5 KB Created: 2020-09-01 19:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c4c6c0c8dfc24444ba1c4bc357e4089 SHA-1: 5cdcf28162ca154b72e0181731e02c7620d4b31a SHA-256: 5e8e1ec33f0c9b6655a4c803bd449fd65d7f298cdb03001b1d0af2836609b47c
154 Risk Score

Malware Insights

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

The PDF contains a link farm, with many embedded URLs pointing to external PDF files, and one primary URL identified as a malicious redirector. The document body, though heavily obfuscated, contains the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly indicated maliciousness, and the PDF structure itself is flagged for linking to known malicious infrastructure.

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=platform+bed+with+storage+no+headboard
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/33a2e4_47ef502589f842188d224e84f31fb3e0.pdf
    • https://static.usrfiles.com/ugd/9e41f0_8874db36d4b74f6aa178f9facbd8ba57.pdf
    • https://static.usrfiles.com/ugd/b8c837_b95716b858614aa88eb1b35794524522.pdf
    • https://static.usrfiles.com/ugd/7603ae_7897697e2d5c465387ca198cc4b01a58.pdf
    • https://static.usrfiles.com/ugd/b8c837_ee60ffe794b9420398a5a1d2f0fbddd4.pdf
    • https://static.usrfiles.com/ugd/65b209_b5790b1344ea4f2eaf0ff7a61a340dec.pdf
    • https://static.usrfiles.com/ugd/ca32a8_785e6909bcfd457582214c5131fa84cd.pdf
    • https://static.usrfiles.com/ugd/40b9e6_75a770622c3f45bb9ec9b37718b2db40.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kefemomorevogik.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/befuxaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/4016/1435/files/lenoteramumikifu.pdf
    • https://static.usrfiles.com/ugd/df4650_ceafb49fd3874289aced6da9d4bc8b3d.pdf
    • https://static.usrfiles.com/ugd/b8c837_337eaea437404630ab88b982952dc62e.pdf
    • https://static.usrfiles.com/ugd/b8c837_5b0552f6909d4ddd9549ca0bf470489b.pdf
    • https://static.usrfiles.com/ugd/b8c837_649517d3e2b14ba1816d4229783b3e13.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_off00008223.bin
e39f3fca13ce3d0f96c292924605d64ca7cdd29a8d66296a46b3a4cb75dab390
pdf-font-stream PDF embedded font (sfnt) at offset 0x8223 5552 bytes
font_01_sfnt_off000094ea.bin
164292b7621cd63a964594a94979e761afdc239da4f314d2e9e793b5b8134664
pdf-font-stream PDF embedded font (sfnt) at offset 0x94EA 10824 bytes