Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a840fe07b46b294…

MALICIOUS

PDF

32.3 KB Created: 2020-08-29 20:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23610ee7c9c649172a12d04de7c1b49e SHA-1: 32276673cc5e1b28d5dabbc5cdc0ef619c8712f4 SHA-256: 6a840fe07b46b294a21cac51e5c6c409933a99c9a0bf29e65418d0c5a5f45f5f
154 Risk Score

Malware Insights

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

This PDF document contains embedded links, one of which points to a known malicious redirector infrastructure at 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to direct users to malicious content. The presence of numerous external PDF links, many pointing to benign content, indicates a link farm strategy, likely to obscure the malicious redirector. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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=cookie+jar+ohio
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_7f4278d71d22471597b283dbeea6eddd.pdf
    • https://static.usrfiles.com/ugd/b8c837_78d6fa8d79c14cc48711ea3eae8d0953.pdf
    • https://static.usrfiles.com/ugd/7f46b5_4f04cd16c46b43138ee1fce5e3ef6a1d.pdf
    • https://cdn.shopify.com/s/files/1/0429/1792/0934/files/university_admission_letter.pdf
    • https://cdn.shopify.com/s/files/1/0439/8107/8686/files/rakenenataju.pdf
    • https://static.usrfiles.com/ugd/b8c837_053808e8de0a4b62b6f65f7f8946bbac.pdf
    • https://static.usrfiles.com/ugd/b8c837_d2cebcae217b434ea6de0aeef9b1e0b3.pdf
    • https://static.usrfiles.com/ugd/8d0191_b976a79327ea4c49b8aba14b3d0efc56.pdf
    • https://static.usrfiles.com/ugd/b8c837_73d35167e3314a91b553809de6946d12.pdf
    • https://static.usrfiles.com/ugd/b8c837_c20eb92b6cb9488897b5fdd42d1e0f5c.pdf
    • https://static.usrfiles.com/ugd/b8c837_cce7a4f23653497ebb1e0607be8b4cf1.pdf
    • https://static.usrfiles.com/ugd/b8c837_d01a7cd95c214d478b765003b0f36d62.pdf
    • https://static.usrfiles.com/ugd/b8c837_0afb0f52b8904898960e2504f864322e.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_off000042d2.bin
deca054484d928295b564570f7da7aae735fe00b9ae56edc3930bee277bc371d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x42D2 4608 bytes
font_01_sfnt_off00005274.bin
f1557ec18a0afa691db27162858fb3842f8b2462a02d6d821006b3930d3481c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5274 10052 bytes

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