Malicious PDF — malware analysis report

Static analysis result for SHA-256 00f330d5e7d3d8cb…

MALICIOUS

PDF

41.7 KB Created: 2020-08-02 20:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8053ac479ff981aabc4cc55a92f3935c SHA-1: dcd776c7842f8fbd44a807144ae63b078897b329 SHA-256: 00f330d5e7d3d8cbeb790ea19c603d7ab832cf7ff74f735cbfd1c91adf936928
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, indicative of a link farm or SEO poisoning tactic. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.cc/pify?keyword=implement+linked+list+in+java', suggesting an attempt to direct users to malicious content. 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.cc/pify?keyword=implement+linked+list+in+java
    • http://files.nbpsrc.ca/uploads/1/3/0/9/130969985/a4c12404.pdf
    • http://files.johb.org/uploads/1/3/1/4/131438427/xudalimefu.pdf
    • http://files.stylebybarbara.com/uploads/1/3/0/8/130874115/tozifek.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/2359/7725/files/the_macro_economy_today.pdf
    • https://cdn.shopify.com/s/files/1/0434/5063/0296/files/samegusonupixoweb.pdf
    • https://cdn.shopify.com/s/files/1/0431/0152/0029/files/jipoxagun.pdf
    • https://cdn.shopify.com/s/files/1/0432/6447/5299/files/28987553745.pdf
    • https://cdn.shopify.com/s/files/1/0435/7927/7467/files/51616927799.pdf
    • https://cdn.shopify.com/s/files/1/0438/3136/1686/files/d3_google_maps.pdf
    • https://cdn.shopify.com/s/files/1/0433/5199/8623/files/xogil.pdf
    • https://cdn.shopify.com/s/files/1/0430/0485/4426/files/6379923405.pdf
    • https://cdn.shopify.com/s/files/1/0430/4207/8877/files/dosewivamifanudam.pdf
    • https://cdn.shopify.com/s/files/1/0440/8098/8325/files/moretopa.pdf
    • https://cdn.shopify.com/s/files/1/0432/8361/1801/files/siredowenodidijafana.pdf
    • https://cdn.shopify.com/s/files/1/0432/2872/5405/files/88921297804.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_off0000612a.bin
8446a5c5c865afafcb505ecefd95408af904b986e23c0706ea639f5012f7ca88
pdf-font-stream PDF embedded font (sfnt) at offset 0x612A 5144 bytes
font_01_sfnt_off0000729f.bin
119cbfde383ca2da9a5baf462162bdc5096bf8910b7ddbaf8619eaf3355d4fb6
pdf-font-stream PDF embedded font (sfnt) at offset 0x729F 12168 bytes