Malicious PDF — malware analysis report

Static analysis result for SHA-256 b29baafcac301b88…

MALICIOUS

PDF

39.9 KB Created: 2020-08-21 13:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9494167aa4fb6e7f6af3b85e93b6b5f SHA-1: bf79863e69678db5f2f500c6ac7242e7f87bf206 SHA-256: b29baafcac301b884f1a832d23c19f2e841ae03bc4a23ca6f4ac18dda4255a08
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One critical heuristic firing indicates a link to known malicious redirector infrastructure at 'ttraff.ru'. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be obfuscated or corrupted, but the presence of the 'autopsy reports texas' keyword alongside the malicious links suggests a lure for 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.ru/pify?keyword=autopsy+reports+texas
    • http://files.sittichai.com/uploads/1/3/2/6/132681501/duruleti.pdf
    • https://cdn.shopify.com/s/files/1/0432/2207/3506/files/jabatogeveroxupapasapesod.pdf
    • https://cdn.shopify.com/s/files/1/0432/7217/5781/files/karojefumetakakosop.pdf
    • https://cdn.shopify.com/s/files/1/0435/9133/6099/files/xinebiruzepewebererobetod.pdf
    • https://cdn.shopify.com/s/files/1/0428/8770/8825/files/minecraft_feed_the_beast_infinity_evolved_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/5169/6796/files/agent_vinod_songs_free_mr_jatt.pdf
    • https://cdn.shopify.com/s/files/1/0434/7235/5478/files/86779813728.pdf
    • https://cdn.shopify.com/s/files/1/0433/7254/4150/files/vifaludo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5630/0186/files/no_love_august_alsina_mp3.pdf
    • https://cdn.shopify.com/s/files/1/0439/0223/8875/files/55900524806.pdf
    • https://cdn.shopify.com/s/files/1/0433/2175/3758/files/84857242190.pdf
    • https://cdn.shopify.com/s/files/1/0435/7432/9499/files/65319800496.pdf
    • https://cdn.shopify.com/s/files/1/0433/4993/4229/files/1857219983.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f9f.bin
445a862ed623bc4e82e5103341866492527c61f1b2844d1266a19c1057b3fbf7
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F9F 4940 bytes
font_01_sfnt_off00007082.bin
79db5564174faf032096852b41e838ccbbd2be7d88ab8606302bff13990d4c9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7082 10212 bytes