Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b79f743fb84bb5…

MALICIOUS

PDF

41.4 KB Created: 2020-08-26 10:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d43d9cd871739cbae9ce1b6346addf8 SHA-1: 66a7f4370e56dbc60f87ca1b2b920b56c6716a60 SHA-256: f4b79f743fb84bb57fabc4add9468b02158eba814b5f385bf1f6fdc41c5937e0
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/pify?keyword=power+system+pdf'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The presence of a large number of embedded external links, many hosted on Shopify, further supports the link farm tactic. The ML classifier also strongly flagged this PDF as malicious.

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=power+system+pdf
    • http://files.roanclay.com/uploads/1/3/0/7/130740097/873e71c4897.pdf
    • https://cdn.shopify.com/s/files/1/0437/2283/4071/files/59986348658.pdf
    • https://cdn.shopify.com/s/files/1/0431/6200/9760/files/xuvosilagewofuzosodozek.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3089/files/91392054537.pdf
    • https://cdn.shopify.com/s/files/1/0437/5989/4689/files/30148250166.pdf
    • https://cdn.shopify.com/s/files/1/0439/6512/0670/files/vector_tangente_normal_y_binormal_calculo_vectorial.pdf
    • https://cdn.shopify.com/s/files/1/0449/9764/0360/files/95803702354.pdf
    • https://cdn.shopify.com/s/files/1/0430/6200/1821/files/werojofepejaxemeb.pdf
    • https://cdn.shopify.com/s/files/1/0435/2029/5064/files/30963126823.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_off00005f73.bin
05c984608fe330de8e87b8e01cdf02fccc4a2720250468ff31a4a5c38262906d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F73 5140 bytes
font_01_sfnt_off000070f4.bin
4cf4f1c64be21d1b778bc6c0ab4f3a3054a1e7087080c26f14931b84fc4396be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70F4 12812 bytes

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