Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dcb5b21800162ef…

MALICIOUS

PDF

35.7 KB Created: 2020-08-30 07:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d487348f7c203eb53ea993f7c7c48ed SHA-1: 5902c463d2ec55169b497883cce6cab59d6fc89b SHA-256: 0dcb5b21800162effd9c03a377bed958dea975bebe5acf20406979489d985b30
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is presented in the document body as information about scholarships. This indicates a phishing or scam attempt designed to redirect users to malicious 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.cc/wix?keyword=resultados+de+becas+del+estado+de+mexico
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6403/3429/files/zogre_flesh_eaters_osrs_quick_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/5817/5901/files/57937235853.pdf
    • https://cdn.shopify.com/s/files/1/0437/8607/6309/files/kolajede.pdf
    • https://cdn.shopify.com/s/files/1/0438/9748/7512/files/bharti_axa_general_insurance_online_policy.pdf
    • https://cdn.shopify.com/s/files/1/0434/0878/5562/files/vewebeg.pdf
    • https://cdn.shopify.com/s/files/1/0427/6341/9814/files/3232005825.pdf
    • https://cdn.shopify.com/s/files/1/0433/6173/0718/files/92654257255.pdf
    • https://static.usrfiles.com/ugd/269bb8_53836f8be5c445129d9d4f1d7dfc4acb.pdf
    • https://static.usrfiles.com/ugd/b8c837_854c2fd46a664c888cd916e048a33000.pdf
    • https://static.usrfiles.com/ugd/4d6844_7267e651aac34cc48f9cf9faa3a5e44e.pdf
    • https://static.usrfiles.com/ugd/b8c837_c7112932bd574c32bcf9b88ad9cab949.pdf
    • https://cdn.shopify.com/s/files/1/0436/1447/0302/files/emmett_kelly_figurines_price_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/0237/9939/files/34201631932.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2119/files/journaux_algerie_38.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_off00004cc6.bin
94a18c021cc82f5d80163ba3bb2a0e8225908d8bc92c47541b3f07f5ef0854e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x4CC6 5204 bytes
font_01_sfnt_off00005e67.bin
34dcff7f5daff30c121a34f64402390aa63b18b36dd72ad4cc16bce8bacc6db5
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E67 10936 bytes