Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4bda72eee263694…

MALICIOUS

PDF

44.2 KB Created: 2020-08-19 07:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 987e65b7955133d82c4da7456a6bcf22 SHA-1: 2a3950803cf7289563e451142c721ac476e78e2b SHA-256: d4bda72eee263694b9101b2ae91c6e68dad3f288ba19bf5ceee761b5933fb217
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, specifically pointing to 'https://ttraff.cc/pify?keyword=operant+conditioning+practice+worksheet+answers'. This link is presented within the document body, disguised as an answer key for a worksheet. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many of which point to Shopify domains hosting other PDFs. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves luring the user to the malicious redirector.

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=operant+conditioning+practice+worksheet+answers
    • http://tugadaxa.nottsu3anetwork.org/uploads/1/3/1/4/131438641/d2b4c0818614c0.pdf
    • http://files.prixusmedical.com/uploads/1/3/0/7/130776478/e730559.pdf
    • http://xoxelodup.theuofstrength.com/uploads/1/3/1/6/131606490/5e88fab832f5195.pdf
    • http://xewiret.blueirisnaturals.com/uploads/1/3/1/0/131070450/1151452.pdf
    • http://files.neloukeramati.com/uploads/1/3/0/8/130814101/lopisavefegemebivu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7982/6584/files/96192242062.pdf
    • https://cdn.shopify.com/s/files/1/0436/8993/5002/files/16276432497.pdf
    • https://cdn.shopify.com/s/files/1/0430/4352/0666/files/futuretos.pdf
    • https://cdn.shopify.com/s/files/1/0431/2478/5319/files/aviso_de_privacidad_estado_de_mexico.pdf
    • https://cdn.shopify.com/s/files/1/0428/7135/7596/files/pexapobe.pdf
    • https://cdn.shopify.com/s/files/1/0427/4146/5244/files/21155874160.pdf
    • https://cdn.shopify.com/s/files/1/0432/8764/2267/files/arrowverse_timeline_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/3993/2064/files/bubakefelixufijiboxa.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_off0000651d.bin
611b1ad3e54afbf318fc9bac49511751a468f72748a791c0076926c94d505a24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x651D 5488 bytes
font_01_sfnt_off000077ca.bin
91b0f913419a6b7cfc648023e2c64b26592159412c510e07d6b49af1eb95905e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77CA 13840 bytes

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