Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8543a6e92b3a843…

MALICIOUS

PDF

53.7 KB Created: 2020-08-07 23:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6c7d850c4707aa5fd41bb04caf0d23f SHA-1: 3901b2313a7cf0950feca6886fd71fffa2f48283 SHA-256: d8543a6e92b3a843050c926984de299ec048a57dc60c21337def61ea439bb479
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify-hosted PDF files, indicating a potential link farm or SEO manipulation tactic. One of these links, https://ttraff.ru/pify?keyword=edematous+skin+disease+in+buffaloes+pdf, is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was largely unreadable binary data, making it difficult to determine a more specific attack pattern beyond link manipulation.

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/pify?keyword=edematous+skin+disease+in+buffaloes+pdf
    • http://files.icsc-companies.com/uploads/1/3/1/6/131636678/5828212.pdf
    • http://files.paintingsbychrislwilliams.com/uploads/1/3/0/7/130775971/472671.pdf
    • http://files.jikidenreikipathways.com/uploads/1/3/2/7/132740350/xoporufoboz.pdf
    • https://cdn.shopify.com/s/files/1/0434/4433/8838/files/bewokala.pdf
    • https://cdn.shopify.com/s/files/1/0432/9861/9557/files/loniw.pdf
    • https://cdn.shopify.com/s/files/1/0438/5079/3110/files/60013271955.pdf
    • https://cdn.shopify.com/s/files/1/0435/4922/9220/files/73887551170.pdf
    • https://cdn.shopify.com/s/files/1/0436/0876/8675/files/mivedanobu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0601/7186/files/60036946374.pdf
    • https://cdn.shopify.com/s/files/1/0431/1154/7037/files/gogul.pdf
    • https://cdn.shopify.com/s/files/1/0435/2419/4468/files/38858589832.pdf
    • https://cdn.shopify.com/s/files/1/0434/9516/2022/files/48994474940.pdf
    • https://cdn.shopify.com/s/files/1/0435/5080/2081/files/jadetoxatoxibutuxowite.pdf
    • https://cdn.shopify.com/s/files/1/0427/6705/7063/files/36546336688.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0094/files/53735480431.pdf
    • https://cdn.shopify.com/s/files/1/0432/7030/7995/files/12378091985.pdf
    • https://cdn.shopify.com/s/files/1/0430/4257/0402/files/46105818980.pdf
    • https://cdn.shopify.com/s/files/1/0430/0141/3785/files/cathflo_activase_instructions.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000086af.bin
c27bbc6d7d4007c6ee1ca5027114104ca958b84c4d737de400c97d623c7bd5e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86AF 5136 bytes
font_01_sfnt_off00009811.bin
c6dab5cc88c36c7c69f23135bd1e22431449da854acc8a32be39899ad3404f0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9811 10336 bytes
font_02_sfnt_off0000bb3d.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB3D 4324 bytes

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