Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d97f9d1fb2efb55…

MALICIOUS

PDF

48.0 KB Created: 2020-08-29 20:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 667d2a0d42ac0374d9f2c5d376aa8a0b SHA-1: 7f6c58952b5d162b4b4481b6a6dc16e643ebaefe SHA-256: 6d97f9d1fb2efb556b7a2b67e9212b7f9b1c861fc5545d721e2cb1ced657dbd7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.cc/wix?keyword=np246+transfer+case+parts'. Additionally, it exhibits a PDF link farm pattern, embedding numerous links to external PDFs, with the first identified as 'https://cdn.shopify.com/s/files/1/0431/0607/4778/files/biogas_plant_project_for_students.pdf'. The document body, though partially corrupted, contains text related to 'np246 transfer case parts' and the authoring application, suggesting a lure to disguise the malicious links.

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/wix?keyword=np246+transfer+case+parts
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/0607/4778/files/biogas_plant_project_for_students.pdf
    • https://cdn.shopify.com/s/files/1/0428/6945/7063/files/97129923422.pdf
    • https://cdn.shopify.com/s/files/1/0431/6656/4507/files/bopexexudilebimirenujinen.pdf
    • https://cdn.shopify.com/s/files/1/0434/4214/3397/files/67124142472.pdf
    • https://cdn.shopify.com/s/files/1/0434/7595/9973/files/chernobyl_free_season_1.pdf
    • https://cdn.shopify.com/s/files/1/0427/4988/6620/files/bivufujuzomavig.pdf
    • https://cdn.shopify.com/s/files/1/0432/5310/4790/files/64726877230.pdf
    • https://cdn.shopify.com/s/files/1/0431/7832/8221/files/kagezukusirikozoduroxeli.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/instrumentation_and_control_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/9417/2058/files/pozoluxutemozala.pdf
    • https://cdn.shopify.com/s/files/1/0429/0553/4620/files/jixizotabozezuzabemekit.pdf
    • https://cdn.shopify.com/s/files/1/0462/2444/1498/files/saniveg.pdf
    • https://cdn.shopify.com/s/files/1/0431/3127/3370/files/tirimamipateduxu.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_off000064b1.bin
00b749abfb7c4d1c2fdf45c6b63579299015ca5bfa6cd4a9c5149a1387731f0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64B1 4948 bytes
font_01_sfnt_off00007583.bin
9713e15081022e20d31d1e6ee4ee85abd201b13a2205f130d1bd070542d20c50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7583 15340 bytes
font_02_sfnt_off0000a587.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA587 4324 bytes

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