Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a1f3824fb84990…

MALICIOUS

PDF

66.5 KB Created: 2020-08-11 21:38:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc79df5fe0c943a25cce150f67d3b8f2 SHA-1: 14ffcbb20e8af8d5a033c9e2c004ab92d0d169ab SHA-256: 37a1f3824fb849902af2ae0418da862f9d5fced6f5643901508b34b456688111
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. This URL is embedded within the document body, disguised as a link to a PDF. The presence of numerous external links, many hosted on Shopify, suggests a link farm designed to attract traffic. The ML classifier also strongly indicated maliciousness.

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=medical+nanotechnology+and+nanomedicine+pdf
    • http://files.ogphotography1.com/uploads/1/3/1/3/131379894/9187962.pdf
    • http://files.happysleepermattress.com/uploads/1/3/0/7/130775866/3025766.pdf
    • http://files.jivikabiervliet.com/uploads/1/3/1/6/131606069/boduwu.pdf
    • http://files.empowerednation.net/uploads/1/3/1/8/131856757/gavuw-gipumegik.pdf
    • https://cdn.shopify.com/s/files/1/0430/9617/8845/files/1234052951.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/78614266902.pdf
    • https://cdn.shopify.com/s/files/1/0429/8414/5049/files/1996_toyota_camry_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/3748/2405/files/95634986648.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8090/files/debitel_kndigung_vorlage.pdf
    • https://cdn.shopify.com/s/files/1/0430/1966/5561/files/benakudikomojopom.pdf
    • https://cdn.shopify.com/s/files/1/0431/1498/7669/files/30524075559.pdf
    • https://cdn.shopify.com/s/files/1/0432/5205/6227/files/terokupom.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46496449222.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_off0000c531.bin
0cb22a58f5763bd4aff724e42299d270f1b64614ada051137383bbbc09b0b854		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC531 5404 bytes
font_01_sfnt_off0000d77c.bin
17d5a1c1c0301c65579a61c127c92f7c2f8a30ed26be7c61c83670ddb5a6169f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD77C 11016 bytes

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