Malicious PDF — malware analysis report

Static analysis result for SHA-256 8497b8c6ff605332…

MALICIOUS

PDF

63.1 KB Created: 2020-07-18 21:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 438721b785abea80efdf27833b2dd1f3 SHA-1: 8c6cc2faefa11dd900eb6e9c43e3f7b62fce2baf SHA-256: 8497b8c6ff6053321ac05a5a165629369c4b0d3d30905a061febe239e5eaf837
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'ttraff.com'. While no scripts were extracted, the presence of numerous outbound links indicates an attempt to direct users to potentially harmful content. The document's metadata suggests it was generated by wkhtmltopdf, a tool often used to create PDFs from web 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.com/wb?keyword=information%20and%20communication%20technology%20pdf%20in%20marathi
    • http://files.cbspmitchelstown.com/uploads/1/3/1/4/131407492/4963013.pdf
    • http://files.cammcdonaldphoto.com/uploads/1/3/1/4/131407233/puramajawesutetedax.pdf
    • http://files.glenoravet.com/uploads/1/3/2/6/132683147/gimeseriwijisevuxu.pdf
    • http://files.venissimo.com/uploads/1/3/0/7/130776110/galejobuwuti.pdf
    • http://files.eagleglobal.org/uploads/1/3/1/4/131483955/difop-gokaxekogiraso-panepopasaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0820/4704/files/lokexatavul.pdf
    • https://cdn.shopify.com/s/files/1/0431/4539/6386/files/titirakiwarukazesi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7338/8190/files/95532023960.pdf
    • https://rativiwowo.files.wordpress.com/2020/07/getuwowufebogusaronir.pdf
    • https://xasarev.files.wordpress.com/2020/06/69516062113.pdf
    • https://naxolobixunu.files.wordpress.com/2020/06/46844878168.pdf
    • https://cdn.shopify.com/s/files/1/0432/1722/3840/files/20105305661.pdf
    • https://cdn.shopify.com/s/files/1/0432/4907/4336/files/vupexudolizagenebolizewe.pdf
    • https://cdn.shopify.com/s/files/1/0428/8066/3705/files/45437289267.pdf
    • https://cdn.shopify.com/s/files/1/0430/4217/7181/files/8124902021.pdf
    • https://cdn.shopify.com/s/files/1/0429/1811/7543/files/22489890926.pdf
    • https://cdn.shopify.com/s/files/1/0432/0113/4754/files/36241221627.pdf
    • https://cdn.shopify.com/s/files/1/0431/3622/1341/files/83150032502.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b877.bin
d9c834d599d6eaa93a2413ae9210c5db09c8d2a84f1e87547ceea2c9d8b6a5a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB877 5312 bytes
font_01_sfnt_off0000ca54.bin
61f69bdf7cb95790120abae9b7f9076ecbc3fd42b0ea2471104603646d4098d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA54 10688 bytes

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