Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4915bb1b9923c20…

MALICIOUS

PDF

43.5 KB Created: 2020-08-08 05:40:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: adc7593fdb528200814d311fb0ce103a SHA-1: b53c5fa8bb1ad78ec86bd400565e9cc82566ba87 SHA-256: c4915bb1b9923c205c714121163eb8566e8b080f3b5976431738b6bbd69ce13b
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/pify?keyword=approximation+questions+for+sbi+po+pdf+download'. It also contains a PDF link farm heuristic, suggesting it's part of a larger SEO manipulation scheme. The document body, though heavily obfuscated, contains the same malicious URL, reinforcing the lure. The primary attack pattern is social engineering via a deceptive link.

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=approximation+questions+for+sbi+po+pdf+download
    • http://files.awrightdehernandez.com/uploads/1/3/0/7/130739510/290758.pdf
    • http://files.mackeiganmarketing.com/uploads/1/3/1/4/131452732/sodopafesub.pdf
    • http://tudugirok.terraloka.com/uploads/1/3/2/6/132682646/xefowabuxovibet_guroj.pdf
    • https://cdn.shopify.com/s/files/1/0428/8295/7478/files/mathematics_formula_of_class_11.pdf
    • https://cdn.shopify.com/s/files/1/0432/8924/7894/files/jboss_application_server_7_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0428/7676/4327/files/bigas.pdf
    • https://cdn.shopify.com/s/files/1/0429/5340/8675/files/7114669344.pdf
    • https://cdn.shopify.com/s/files/1/0434/6665/3858/files/mikefubusazatodewol.pdf
    • https://cdn.shopify.com/s/files/1/0428/7135/7596/files/38681109948.pdf
    • https://cdn.shopify.com/s/files/1/0428/4809/2323/files/lakowufawefagevativojusem.pdf
    • https://cdn.shopify.com/s/files/1/0435/8212/8283/files/35278004392.pdf
    • https://cdn.shopify.com/s/files/1/0428/5769/3347/files/tikugeruwirobibifata.pdf
    • https://cdn.shopify.com/s/files/1/0427/9818/6663/files/kegadatewad.pdf
    • https://cdn.shopify.com/s/files/1/0431/3271/5163/files/42128965916.pdf
    • https://cdn.shopify.com/s/files/1/0434/2058/2050/files/sezuvolupuzijewagebu.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_off000065f0.bin
25976cf690857ff46ab23d86bf799d47055317db79426b497a1a7c090ce79a3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65F0 5604 bytes
font_01_sfnt_off000078f0.bin
dcb676d1e302baa4b71eb604b9132eca8c3e094c4548c2d311a653195b6e4a22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78F0 11720 bytes

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