Malicious PDF — malware analysis report

Static analysis result for SHA-256 935c6aa8ab9d43f7…

MALICIOUS

PDF

39.6 KB Created: 2020-08-06 23:40:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aef1a35ae3bc2fb4d64374522bf49d6a SHA-1: 2470db90aac613ccb6ef2fef85f142bc427e84a6 SHA-256: 935c6aa8ab9d43f7305bd7e23e22dd93edc2fa030ec1500ed91c5bc5daf72572
150 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific malicious redirector URL, indicating a lure to external malicious content. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM strongly suggest this is a phishing or redirection attempt. The ML classifier also flagged it with high confidence. The document body contains the malicious URL, reinforcing 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=protein+structure+levels+of+protein+structure+pdf
    • http://files.fideliaibekwe.info/uploads/1/3/1/4/131452929/ribabafe-zitivokorilimux-fikisujitugar-fuxajat.pdf
    • http://files.syncdental.net/uploads/1/3/0/7/130775862/jizorovivemuji.pdf
    • http://files.ericmouledoux.com/uploads/1/3/0/7/130774990/fikemalepim.pdf
    • http://files.trinityprespca.org/uploads/1/3/2/6/132683137/zuwuvasin_sodutenutubin_zopanene_sawoba.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rerotapok.pdf
    • https://cdn.shopify.com/s/files/1/0435/6702/2239/files/develunex.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xigidewepiwunabifaw.pdf
    • https://cdn.shopify.com/s/files/1/0439/5014/5704/files/lovujezezu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6097/7048/files/92334392966.pdf
    • https://cdn.shopify.com/s/files/1/0427/4877/2508/files/zoology_definition.pdf
    • https://cdn.shopify.com/s/files/1/0429/3941/6732/files/famadaburijod.pdf
    • https://cdn.shopify.com/s/files/1/0437/2067/1386/files/sikesamemeb.pdf
    • https://cdn.shopify.com/s/files/1/0438/6825/8469/files/94393203318.pdf
    • https://cdn.shopify.com/s/files/1/0433/7745/9365/files/nefusafikubusigonuxap.pdf
    • https://cdn.shopify.com/s/files/1/0439/6656/2462/files/vatiwoxezixaselugafaz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66916333827.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_off00005e61.bin
51d6303b78478dc805d1d2e0d66ad207096a19aabf2c6cd89ce9dc528f6c1e2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E61 5000 bytes
font_01_sfnt_off00006f7f.bin
2be22c3271902fa060e84fb823d399c2a3d19629f9851858540d0463fe24409a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F7F 9852 bytes

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