Malicious PDF — malware analysis report

Static analysis result for SHA-256 91498265f13262c8…

MALICIOUS

PDF

87.9 KB Created: 2020-07-29 22:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97deb2e7810ce7ca853360db17a9d173 SHA-1: 42e5a0543dc067b457029209c881e55b5ac3c0ba SHA-256: 91498265f13262c8c161021696637d205bd4da9598c1ed647dd38563c4c3d3bb
150 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, pointing to 'https://ttraff.ru/pify?keyword=article+grammar+examples+pdf'. Additionally, another critical heuristic indicates a PDF link farm, suggesting an attempt to distribute malicious content or engage in SEO abuse. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded malicious URL is sufficient to classify the attack pattern.

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=article+grammar+examples+pdf
    • http://files.gamingcomputersstoreunit.com/uploads/1/3/1/1/131163980/e9388b1dfc7e1e.pdf
    • http://files.brandonmoorecomposition.com/uploads/1/3/1/4/131438766/muxigem.pdf
    • http://files.newra.org/uploads/1/3/1/6/131607712/jixube.pdf
    • http://files.carinandbenblazer.com/uploads/1/3/2/6/132683000/masejolonijo.pdf
    • http://files.ncwnavhda.org/uploads/1/3/1/4/131407695/tapixewupa.pdf
    • https://cdn.shopify.com/s/files/1/0429/9010/8833/files/rosijam.pdf
    • https://cdn.shopify.com/s/files/1/0428/2561/3468/files/faleroforag.pdf
    • https://cdn.shopify.com/s/files/1/0431/9471/2228/files/23385926204.pdf
    • https://cdn.shopify.com/s/files/1/0429/3237/1622/files/gebazevobewatafebuwa.pdf
    • https://cdn.shopify.com/s/files/1/0432/6542/5570/files/gutegukugasapapatujif.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8573/files/torunapiviragatexuge.pdf
    • https://cdn.shopify.com/s/files/1/0429/6717/1223/files/58906404188.pdf
    • https://cdn.shopify.com/s/files/1/0430/9218/1153/files/gonodiwubibijebiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/9846/4661/files/sisomus.pdf
    • https://cdn.shopify.com/s/files/1/0436/4258/5241/files/92777595672.pdf
    • https://cdn.shopify.com/s/files/1/0435/3510/6200/files/26808155547.pdf
    • https://cdn.shopify.com/s/files/1/0433/9377/7827/files/nojalixemujo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da8d.bin
e81da31906be60e6f3fa075f2ae622e59be5bb8b08b2b2740885c85c0513bcfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8D 5104 bytes
font_01_sfnt_off0000ebe4.bin
a1f42ce3b9488acbc0d2c3dc441fd5530bd8993e679683c3dd1d3db8a659a049		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE4 5816 bytes
font_02_sfnt_off0000feda.bin
6ee03fb2dd54d5326506785bceabe45f6a8041609dacaf7b74c42637e2bd36a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDA 19600 bytes
font_03_sfnt_off000139c9.bin
2f8ab46ae156e49ecd92ae4ac05a69e98e96121ec6e81a6ecdc4060d20b3396e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139C9 16704 bytes

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