Malicious PDF — malware analysis report

Static analysis result for SHA-256 64200861d73a7c21…

MALICIOUS

PDF

70.3 KB Created: 2020-08-07 09:35:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1b20afe2aa643c61c476c6f0dc7bbf8 SHA-1: c67b4a19dd7f3bd64bbfb540d976cdbc5a1297e1 SHA-256: 64200861d73a7c219ba36e79e8a07b91a2d81c8dd9d28e50b79e5e6525df8f51
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic indicating it links to known malicious redirector infrastructure, specifically 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to trick users into clicking it. The presence of numerous other PDF links further supports a link farm or SEO poisoning tactic. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=toronto+alexithymia+scale+20+pdf
    • http://files.jazzbeyondborders.com/uploads/1/3/1/6/131636745/gabiwijogirif.pdf
    • http://files.dogbitesbakery.com/uploads/1/3/0/7/130738779/pisowew-vesutiregatuf.pdf
    • http://files.gracehillps.com/uploads/1/3/2/6/132682110/1557104.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6954/6395/files/48590697336.pdf
    • https://cdn.shopify.com/s/files/1/0438/6878/2757/files/64246484366.pdf
    • https://cdn.shopify.com/s/files/1/0428/7974/6201/files/jumixigobulomukugaxuteser.pdf
    • https://cdn.shopify.com/s/files/1/0429/0881/1427/files/chips_challenge_online.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21884581804.pdf
    • https://cdn.shopify.com/s/files/1/0432/7797/5717/files/wutiboxobirigazagu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tipibag.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4650/files/89553626584.pdf
    • https://cdn.shopify.com/s/files/1/0430/0436/2906/files/gixixiposiwilamu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wetidolurat.pdf
    • https://cdn.shopify.com/s/files/1/0430/7202/8823/files/wupajasexowezadil.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_off0000c800.bin
46a05de35fe521d2b8bb54413804649efbd9f333d296af180faf07b7e016fe26
pdf-font-stream PDF embedded font (sfnt) at offset 0xC800 5788 bytes
font_01_sfnt_off0000db91.bin
790047b145a28508340ef23b39a97815a8af5dc67d7a2dc519444309c5808075
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB91 15688 bytes