Malicious PDF — malware analysis report

Static analysis result for SHA-256 c90864a7142e10d3…

MALICIOUS

PDF

61.5 KB Created: 2020-07-28 01:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afc8d988b10b5e1ebaa11e4fe7d1b0b7 SHA-1: 004c2fd76e75671ee280330ec042a073f97fcb18 SHA-256: c90864a7142e10d362b22c036b643c16a0f6c91a66b0215c68095b4e58fc2f97
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, a technique often used to direct users to malicious websites. One critical heuristic identified a link to a known malicious redirector, and another flagged the document as a link farm. The document body, though heavily obfuscated, contains text related to 'anthelmintic treatment guidelines' and metadata indicating it was generated by wkhtmltopdf, suggesting a lure for users seeking specific information.

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.cc/pify?keyword=anthelmintic+treatment+guidelines
    • http://files.allsaintsreligiouseducation.org/uploads/1/3/0/7/130775174/4099387.pdf
    • http://files.sproutsmyanmar.com/uploads/1/3/2/3/132302863/giburapudiga-dojowul.pdf
    • http://files.reviveandrestore.net/uploads/1/3/0/7/130739081/fobetizi-saxinum-xepigeku-guzurixada.pdf
    • http://files.cozyguesthouses.com/uploads/1/3/1/3/131382030/dunugegupox.pdf
    • https://cdn.shopify.com/s/files/1/0432/8708/5220/files/ranuwixa.pdf
    • https://cdn.shopify.com/s/files/1/0437/5996/0218/files/sokewikaxozifi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3840/7845/files/63574181169.pdf
    • https://cdn.shopify.com/s/files/1/0431/4333/2000/files/vawonavagutubajet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32808714247.pdf
    • https://cdn.shopify.com/s/files/1/0431/4100/5480/files/66815071183.pdf
    • https://cdn.shopify.com/s/files/1/0430/8575/8628/files/28823090662.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/59854739703.pdf
    • https://cdn.shopify.com/s/files/1/0433/3151/8622/files/11974607123.pdf
    • https://cdn.shopify.com/s/files/1/0431/0391/2098/files/61487790098.pdf
    • https://cdn.shopify.com/s/files/1/0432/2341/6995/files/famisaxororex.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_off0000b4f5.bin
d2a09d35254783a89cfe840538e1214452ce1b36c41ce4510442408c7cf4b687		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F5 5112 bytes
font_01_sfnt_off0000c614.bin
1be8287d0b3cf5220a02260b373482dc6dd208fb1a449d8b19c245a278254dd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC614 10108 bytes

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