Malicious PDF — malware analysis report

Static analysis result for SHA-256 860ec7dc93672db0…

MALICIOUS

PDF

38.7 KB Created: 2020-08-30 22:37:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3d5f9e09462cf78f7affa38342d8d2f SHA-1: a1f3f20dd05c06a076293879460cb79de0060402 SHA-256: 860ec7dc93672db06122f1b8d1811cd96e314c6a9e8d1c0a775b40abab1aebb4
154 Risk Score

Malware Insights

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

The PDF contains a prominent link to 'ttraff.cc' which is flagged as a malicious redirector, likely serving as a lure for downloading software. The document body, though heavily obfuscated, also contains this URL and numerous other links to PDF files hosted on various platforms, suggesting a link farm or SEO poisoning attempt to drive traffic. The ML classifier strongly indicated maliciousness, supporting the conclusion that this document is designed to redirect users to potentially harmful content.

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=atlas+v14+download+torrent
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/9ff9b8_5d030ee7439f4eaf9f0fd96b928227ed.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf85d2d082af469d8735312db3fb9416.pdf
    • https://static.usrfiles.com/ugd/dc8a8e_ef4c76e6c3024b338935b710905b796c.pdf
    • https://static.usrfiles.com/ugd/599026_93e1de43c2b2466c8a402ff8cb01924f.pdf
    • https://static.usrfiles.com/ugd/2c608b_62438d480f75464ba1cf2eeef06a450c.pdf
    • https://cdn.shopify.com/s/files/1/0432/0637/7633/files/28067023115.pdf
    • https://cdn.shopify.com/s/files/1/0431/5591/4918/files/teluva.pdf
    • https://cdn.shopify.com/s/files/1/0438/2218/6653/files/susuziramobonituvuz.pdf
    • https://cdn.shopify.com/s/files/1/0431/4831/2738/files/comptia_certification_roadmap.pdf
    • https://cdn.shopify.com/s/files/1/0434/1324/2014/files/alveolitis_seca.pdf
    • https://cdn.shopify.com/s/files/1/0427/9946/4611/files/5364159825.pdf
    • https://static.usrfiles.com/ugd/b8c837_19e7d8f9dffa49db80747831204b553c.pdf
    • https://static.usrfiles.com/ugd/5ecadc_fecccadbbbc04fa8895e1b67bd07be80.pdf
    • https://static.usrfiles.com/ugd/ac72e0_f2cc38f5700c46dbbec10b4f5c482c6c.pdf
    • https://static.usrfiles.com/ugd/b8c837_95e3fd9b63754def9f9f155dcc2c4c7c.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_off00005937.bin
8ffe0e096d85418d958a73b853ba9e015ea85268f14e42cbafb3310b754bc8d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5937 5100 bytes
font_01_sfnt_off00006ab8.bin
cea6ccf198675bb7d3642db8973552bee620eca0d8f48b630c81de0b4dad4549		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB8 10420 bytes

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