Malicious PDF — malware analysis report

Static analysis result for SHA-256 21fe1782392e7d29…

MALICIOUS

PDF

44.9 KB Created: 2020-08-21 12:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aaa7bf89115d5a8ee2ebcdabbca05ccd SHA-1: 4ce3b9edaef5a072a4409cfd5b3782dfc3a3b4d9 SHA-256: 21fe1782392e7d29f2d6c773d7d7e49bb6e4e9f59dd52bd18ed54c153e378387
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded links that redirect to a malicious URL, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text referencing a 'government free credit report' and the malicious URL itself, suggesting a phishing or scam lure. The 'PDF_SEO_LINK_FARM' heuristic indicates a large number of outbound links, further supporting the malicious intent of redirecting users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=government+free+credit+report
    • http://files.intermezzogallery.com/uploads/1/3/1/0/131070113/32561cbfe7ebe.pdf
    • http://files.wwidbq.com/uploads/1/3/0/8/130814066/kufurovudu.pdf
    • http://files.tasty-ink.com/uploads/1/3/1/4/131437636/4162147.pdf
    • http://files.kiberacreativearts.org/uploads/1/3/1/6/131636988/8976299.pdf
    • http://gevefiw.morrispublishingaustralia.com/uploads/1/3/1/0/131071243/5955577.pdf
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/44492774301.pdf
    • https://cdn.shopify.com/s/files/1/0431/2793/1029/files/1645739057.pdf
    • https://cdn.shopify.com/s/files/1/0437/0821/9547/files/61097572094.pdf
    • https://cdn.shopify.com/s/files/1/0434/0016/7589/files/bumuwupik.pdf
    • https://cdn.shopify.com/s/files/1/0438/4718/8640/files/jutadinenam.pdf
    • https://cdn.shopify.com/s/files/1/0453/6372/4443/files/17879888369.pdf
    • https://cdn.shopify.com/s/files/1/0433/0625/4504/files/73482980275.pdf
    • https://cdn.shopify.com/s/files/1/0437/3151/7592/files/pofabipezivejusozedokuw.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_off000072dd.bin
4294947819f64def660be5ea66fca0498e481df4145f76fec42cc05085370c7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72DD 4972 bytes
font_01_sfnt_off000083c1.bin
54c2c28435a9a7e56dada2d3afa2dde75c9efe669bb1b768c79b36d22cf98943		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83C1 10332 bytes

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