Malicious PDF — malware analysis report

Static analysis result for SHA-256 105f08292591b47f…

MALICIOUS

PDF

53.7 KB Created: 2020-08-19 10:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75c6da0ff4a642aa6ccd6ba48be1179c SHA-1: 03548d897530195a51a490540049635437a9ff2e SHA-256: 105f08292591b47f437e8f8c612b81b685c86a87fda2d339d00195470898bb4b
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, which in turn leads to a link farm of other PDFs. The document body text, though heavily obfuscated, contains keywords related to the malicious URL, suggesting a lure. The presence of multiple external PDF links indicates an attempt to distribute further malicious content or engage in SEO manipulation for malicious purposes.

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=linpack+benchmark++windows
    • http://files.paperrockfork.com/uploads/1/3/2/6/132681443/81cf1b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/6337/7048/files/lujibaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/0649/2823/files/23198689573.pdf
    • https://cdn.shopify.com/s/files/1/0432/9763/6512/files/gap_kids_size_chart.pdf
    • https://cdn.shopify.com/s/files/1/0428/0143/0695/files/98881566528.pdf
    • https://cdn.shopify.com/s/files/1/0430/8366/1461/files/13411828502.pdf
    • https://cdn.shopify.com/s/files/1/0431/3022/4794/files/21367449033.pdf
    • https://cdn.shopify.com/s/files/1/0433/1608/4891/files/lifupixilovivew.pdf
    • https://cdn.shopify.com/s/files/1/0431/8242/4215/files/25525329597.pdf
    • https://cdn.shopify.com/s/files/1/0447/8897/3729/files/hillbilly_elegy.pdf
    • https://cdn.shopify.com/s/files/1/0427/9477/8791/files/33902027993.pdf
    • https://cdn.shopify.com/s/files/1/0435/8933/7256/files/43275251984.pdf
    • https://cdn.shopify.com/s/files/1/0427/8799/5807/files/43678764118.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/bengali_movie_shikari_full.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000079ba.bin
8898a28ed7dbee28bd2cebe98a319adca73f42cc79d22411d732d230a6c2b05d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79BA 5228 bytes
font_01_sfnt_off00008b40.bin
3ffb29e382d9afca9b0651582c663ab2065782106b73f1c17051e76273010c0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B40 15992 bytes
font_02_sfnt_off0000bc22.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC22 4324 bytes

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