Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2a1179d98feca79…

MALICIOUS

PDF

45.8 KB Created: 2020-08-06 14:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa3c66ae3b1618d8384d675041986dd3 SHA-1: feafccb1af6d72a2a62884c8285dc57a8b7244f3 SHA-256: b2a1179d98feca79e23104eeff9032109db20bf990a9b5689773680cd908c956
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic indicates the PDF links to a known malicious redirector service, ttraff.com, which is likely used to obscure the final destination of the malicious payload. The document body itself is largely unreadable binary data, but the presence of the malicious redirector and the sheer volume of links suggest a link farm or phishing attempt designed to lead users to harmful 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/pify?keyword=search+engines+name+list+pdf
    • http://tuwepirot.divotees.co.uk/uploads/1/3/1/3/131380729/pedotefef_wuweti.pdf
    • http://files.apachetruckclub.com/uploads/1/3/1/4/131438611/zemesenonow.pdf
    • http://files.jostenmyburgh.com/uploads/1/3/1/3/131380889/f8b2dd22b3f3b.pdf
    • http://files.aquabydesign.co.uk/uploads/1/3/1/6/131637021/3769651.pdf
    • http://files.kalaanylab.org/uploads/1/3/1/3/131380777/tometumezevosevow.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xikidewutuxazumal.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0420/files/29233708743.pdf
    • https://cdn.shopify.com/s/files/1/0435/8127/6319/files/instagram_private_profile_viewer_gametoolkits.pdf
    • https://cdn.shopify.com/s/files/1/0436/2820/0096/files/82235413169.pdf
    • https://cdn.shopify.com/s/files/1/0428/4134/2108/files/fadutam.pdf
    • https://cdn.shopify.com/s/files/1/0430/7179/9449/files/49798832561.pdf
    • https://cdn.shopify.com/s/files/1/0429/8624/2209/files/52453374760.pdf
    • https://cdn.shopify.com/s/files/1/0436/2731/5353/files/15004519890.pdf
    • https://cdn.shopify.com/s/files/1/0439/2153/9240/files/libros_de_arquitectura_de_software_en_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8311/files/lamenizemozojemubekifatax.pdf
    • https://cdn.shopify.com/s/files/1/0431/3343/6066/files/98018507395.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071ee.bin
562a8f9f75d7deb9f774c923e7de9c3d5b83c4b0f447a6f2d9afce50322c3f9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71EE 5672 bytes
font_01_sfnt_off0000850d.bin
bdc4009e2b12fc52cf91bb162eba460a10223e9758e20ef0ebea4be24fc996be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x850D 10968 bytes

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