Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bcb447683da01c3…

MALICIOUS

PDF

40.9 KB Created: 2020-08-24 01:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e04e7978c786d80f14119fc02f6f6b5 SHA-1: 7e4436921c4c4d3c853c8d5532a4eea65f124a47 SHA-256: 3bcb447683da01c3cca7146c3e8f29b333f7587630248e7fdef9646ffe1a137b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

This PDF document was flagged as malicious by an ML classifier and contains numerous embedded links. One critical heuristic identified a link to a known malicious redirector service (ttraff.ru), which is likely used to obscure the ultimate destination of the attack. Another heuristic indicates a PDF link farm, suggesting the document's primary purpose is to distribute multiple external links. The document body itself is largely garbled but contains the same redirector URL, reinforcing its role in the attack chain.

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=two+basic+classification+of+management+information+system
    • http://files.mullumbimbypilates.com/uploads/1/3/0/7/130739916/bac1ff58.pdf
    • http://files.cobilconnect.com/uploads/1/3/0/9/130969853/6ea8d66a.pdf
    • http://files.audienceseurope.com/uploads/1/3/0/7/130776142/sigusupetoromovomo.pdf
    • http://files.fleurspressed.com/uploads/1/3/1/4/131453124/rixogita.pdf
    • http://sefarol.pasadenaphysed.com/uploads/1/3/1/6/131606349/vesodelagebozavize.pdf
    • https://cdn.shopify.com/s/files/1/0435/7573/8527/files/dubois_vs_washington.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/98048873934.pdf
    • https://cdn.shopify.com/s/files/1/0429/5501/4298/files/51050085652.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13977390730.pdf
    • https://cdn.shopify.com/s/files/1/0434/1301/2630/files/internal_audit_duties_and_responsibilities_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0430/8333/3785/files/93643097188.pdf
    • https://cdn.shopify.com/s/files/1/0434/4047/2229/files/zinukedosaxijonarep.pdf
    • https://cdn.shopify.com/s/files/1/0432/4681/3344/files/34827729376.pdf
    • https://cdn.shopify.com/s/files/1/0440/5595/3558/files/bridge_rectifier_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0436/8600/2838/files/xogogodorasekukove.pdf
    • https://cdn.shopify.com/s/files/1/0427/4513/5260/files/4803404126.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_off0000625f.bin
06973b170237cc98b36947a277bc510006acbf2136281a03e7f8f35906ff718c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x625F 5484 bytes
font_01_sfnt_off000074fe.bin
926e04d2c0f133725b7207493ee07587a4341d95f9ab3bee0c916ceab5d9095b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74FE 9832 bytes

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