Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a8ebc8b119900c4…

MALICIOUS

PDF

44.3 KB Created: 2020-08-31 14:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 423cc6434cc47bc3e7410b1211ec6e8a SHA-1: 8dc7f4e14d956db27687775e38669b4d6fb38bc4 SHA-256: 7a8ebc8b119900c4764a0bfff24220e519c025e4a6514534ccf8a81e88244b55
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a prominent link to 'ttraff.com', which is flagged as a malicious redirector. The document body, though obfuscated, contains the same search query as the malicious link, suggesting a lure to trick users into clicking. The ML classifier strongly indicates maliciousness, and the presence of multiple external PDF links points to a link farm or SEO abuse tactic.

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=faster+for+facebook+lite+apk+no+ads
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/6a7407_dc57f28ce0b14bcbb22733c7b4e0240b.pdf
    • https://static.usrfiles.com/ugd/b8c837_a5a42b1e2bd64bd5809fbedd7ab6d539.pdf
    • https://static.usrfiles.com/ugd/f09a9d_325c817233344978a6a5cf5ce4bfd198.pdf
    • https://static.usrfiles.com/ugd/b8c837_8a90c7b58f684c54901b0f8fd0895bd6.pdf
    • https://static.usrfiles.com/ugd/22bf55_8dd33852a4aa4a378b17f401ca62db29.pdf
    • https://static.usrfiles.com/ugd/b8c837_38c9b5435ed4435ba27109d4595ac2ab.pdf
    • https://static.usrfiles.com/ugd/7f16bd_19701f1f502f4673b94639b534e6078c.pdf
    • https://cdn.shopify.com/s/files/1/0440/5002/2550/files/34209912916.pdf
    • https://cdn.shopify.com/s/files/1/0435/7039/7352/files/xulibib.pdf
    • https://cdn.shopify.com/s/files/1/0432/0722/9597/files/30500598684.pdf
    • https://cdn.shopify.com/s/files/1/0428/2348/3548/files/85346974220.pdf
    • https://cdn.shopify.com/s/files/1/0428/8993/7055/files/24353352459.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/48603283215.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/vatativam.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059a4.bin
c81194a3a275a0cb0748abd3dbe611f24a2766bd898da3ac07da95ed1727cda7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59A4 5308 bytes
font_01_sfnt_off00006bbe.bin
e2d68025987e347e44d354a3615d98c916320a7e49eb904d980057f46ded6907		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BBE 10312 bytes
font_02_sfnt_off00008f3e.bin
e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F3E 16092 bytes

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