Malicious PDF — malware analysis report

Static analysis result for SHA-256 990ebe1f36c76f6b…

MALICIOUS

PDF

46.3 KB Created: 2020-08-13 09:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1c95a95802daadccbc4bd451cb79b65 SHA-1: 5e723aedfe4e996edcc983a0cf4da38e7732e1df SHA-256: 990ebe1f36c76f6b774b9be6f8ebceb33f569a8eef6987d904e0390aa89094f7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The document also exhibits characteristics of a PDF SEO link farm, with numerous links to external PDFs, some of which are hosted on potentially malicious domains. The primary malicious URL identified is https://ttraff.cc/wb?keyword=mesa%20boogie%20mark%20v%2025%20manual, which is presented as a manual. The ML classifier also strongly indicated maliciousness.

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/wb?keyword=mesa%20boogie%20mark%20v%2025%20manual
    • http://fafiwuzib.minghuikuo.com/uploads/1/3/1/4/131407005/magowiwumibi.pdf
    • http://files.pioneercareercenter.com/uploads/1/3/1/8/131856339/684817.pdf
    • http://files.marylorart.com/uploads/1/3/2/3/132303312/foxajepoberagiside.pdf
    • https://cdn.shopify.com/s/files/1/0448/4271/3250/files/57316088827.pdf
    • https://cdn.shopify.com/s/files/1/0428/1624/1831/files/can_blockchain_revolutionize_the_supply_chain.pdf
    • https://cdn.shopify.com/s/files/1/0435/8114/5243/files/maytag_quiet_series_200_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/6790/0061/files/rorafixodusotipuz.pdf
    • https://cdn.shopify.com/s/files/1/0430/4509/3530/files/42036140282.pdf
    • https://cdn.shopify.com/s/files/1/0435/9494/0575/files/52095082601.pdf
    • https://cdn.shopify.com/s/files/1/0437/8004/6997/files/zenis.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/9590150980.pdf
    • https://cdn.shopify.com/s/files/1/0429/9508/9559/files/90170084132.pdf
    • https://cdn.shopify.com/s/files/1/0428/7417/5644/files/fosufemefizinenirifur.pdf
    • https://cdn.shopify.com/s/files/1/0438/7926/8520/files/6096769335.pdf
    • https://cdn.shopify.com/s/files/1/0432/6470/4662/files/kolisipoxojukanukozetafu.pdf
    • https://cdn.shopify.com/s/files/1/0439/1564/1000/files/mazoxowaponi.pdf
    • https://cdn.shopify.com/s/files/1/0437/8004/7010/files/buku_al_arabiyah_baina_yadaik.pdf
    • https://cdn.shopify.com/s/files/1/0434/2205/6600/files/adjective_adverb_list.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_off0000758d.bin
a1c8f9eb483ff5c3f9a05542c1e00d7037496b52dae6d83b4333d7f960085579		 pdf-font-stream PDF embedded font (sfnt) at offset 0x758D 5528 bytes
font_01_sfnt_off0000885a.bin
a6eb5260bfb7c9b3e5634b4c05c2643186fbd6986a4878f27e5fc4f93e45a518		 pdf-font-stream PDF embedded font (sfnt) at offset 0x885A 10332 bytes

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