Malicious PDF — malware analysis report

Static analysis result for SHA-256 13ecc723916ea2eb…

MALICIOUS

PDF

40.6 KB Created: 2020-08-23 02:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d81877750b1fa58a8c2cb3119d8fb973 SHA-1: 86b5edb045f1a8f38d510cbb80a94b56a9301d43 SHA-256: 13ecc723916ea2eb912bc9b774627b36b66cee1ad748a9db8a23e582f9e48681
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which are benign but some are unknown. The presence of a 'download button' lure further supports a phishing or social engineering attack pattern. No scripts were extracted, but the malicious link is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=acapella+apk+pro
    • http://files.edwardsseptic.net/uploads/1/3/1/4/131453823/251fa971.pdf
    • http://files.lindeegrantphotography.com/uploads/1/3/0/7/130775694/ca77dbf5aa4199.pdf
    • http://files.warriors-hope.org/uploads/1/3/1/0/131071037/toxutivuzam-likudew-zelalabatu-lujesapoz.pdf
    • http://ridijit.sjeliz.org/uploads/1/3/2/7/132740214/837944.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/4403/5993/files/sandvik_coromant_catalogo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5063/0297/files/budget_direct_travel_insurance.pdf
    • https://cdn.shopify.com/s/files/1/0430/3935/9127/files/nemureferubilutuvade.pdf
    • https://cdn.shopify.com/s/files/1/0430/6770/3457/files/95511383666.pdf
    • https://cdn.shopify.com/s/files/1/0430/6678/5949/files/lines_composed_above_tintern_abbey.pdf
    • https://cdn.shopify.com/s/files/1/0432/7997/4556/files/24208929381.pdf
    • https://cdn.shopify.com/s/files/1/0432/4209/4755/files/nenabunanewatuvisejuj.pdf
    • https://cdn.shopify.com/s/files/1/0428/0880/3495/files/73150232320.pdf
    • https://cdn.shopify.com/s/files/1/0431/7049/6672/files/29683369665.pdf
    • https://cdn.shopify.com/s/files/1/0437/7195/3301/files/53962378424.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_off0000551f.bin
f637ef62ecbc206fa4cc669ec240cc87ee035eb5e5b2c23ef7b8f3997fad6eb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x551F 4356 bytes
font_01_sfnt_off000063e8.bin
732a233b3c2b470d80e0f3d6e815e126f3ba5c5331b0291fca0a226377032270		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63E8 10580 bytes
font_02_sfnt_off000087fc.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87FC 4324 bytes

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