Malicious PDF — malware analysis report

Static analysis result for SHA-256 8436a71aa6b9cb47…

MALICIOUS

PDF

37.3 KB Created: 2020-08-14 22:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55ff1c6766010a85416ac1c71d9d9fef SHA-1: 0326bfb8922843844b6495274cc10f8ee8554702 SHA-256: 8436a71aa6b9cb47ccf29b57cb898a56475444b810777d25746f92964d4853fb
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm designed to redirect users to malicious infrastructure. The primary malicious link identified is https://ttraff.ru/wb?keyword=vegetarian%20recipes%20cookbook%20pdf, which is flagged as a known redirector. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this document is part of a phishing or scam campaign.

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.ru/wb?keyword=vegetarian%20recipes%20cookbook%20pdf
    • http://sumiw.cachevalleyresources.org/uploads/1/3/1/6/131606349/tonapemixez.pdf
    • http://wewomi.crosstownmaple.com/uploads/1/3/1/4/131482975/6437088.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8362/0757/files/turotufizelepedumasik.pdf
    • https://cdn.shopify.com/s/files/1/0433/4141/4552/files/xebofilapalolivajojeke.pdf
    • https://cdn.shopify.com/s/files/1/0431/4346/3074/files/15230421944.pdf
    • https://cdn.shopify.com/s/files/1/0432/9478/5704/files/bootstrap_w3schools_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/4622/4551/files/vubube.pdf
    • https://cdn.shopify.com/s/files/1/0432/2980/6759/files/wanedutorinususapafew.pdf
    • https://cdn.shopify.com/s/files/1/0437/8791/1319/files/zufogerevowulomit.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_off0000520a.bin
74cceb6d322ba7c6b96b7950b26712400377b441482204b9dd3ffdb16db854ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x520A 5460 bytes
font_01_sfnt_off000064a8.bin
466715b9aee8b0653be09442bcad82fb57f509090bbfc48b1ad04d158a12dc2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64A8 11008 bytes

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