Malicious PDF — malware analysis report

Static analysis result for SHA-256 c081a0aab8048b49…

MALICIOUS

PDF

44.0 KB Created: 2020-08-29 09:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 012d2946c3918ac53b81cee1d18ee93a SHA-1: 34752879081b89356e55cee15279e34b79dc8d03 SHA-256: c081a0aab8048b49015410c3780ce38cff8b83a068b9dceb0cc6650f991bb9d8
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to ttraff.ru, which is used in a lure related to 'believer guitar tab sheet music'. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded links, many pointing to Shopify domains. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves luring the user via a deceptive link within the document.

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/wix?keyword=believer+guitar+tab+sheet+music
    • https://cdn.shopify.com/s/files/1/0429/3869/5846/files/70097654174.pdf
    • https://cdn.shopify.com/s/files/1/0432/1764/9819/files/andes_mountain_range_formation.pdf
    • https://cdn.shopify.com/s/files/1/0431/7249/5519/files/vefobidakujanabapo.pdf
    • https://cdn.shopify.com/s/files/1/0465/0211/7528/files/dususewebujamosen.pdf
    • https://cdn.shopify.com/s/files/1/0440/1712/3478/files/strength_of_materials_civil_objective_questions_and_answers.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e4d18378bb14f8e843d2128edca2be6.pdf
    • https://cdn.shopify.com/s/files/1/0428/5802/1027/files/75868220002.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/elf_bowling_2.pdf
    • https://cdn.shopify.com/s/files/1/0446/5026/6787/files/pepumibodudetuvawusiwomug.pdf
    • https://static.usrfiles.com/ugd/b8c837_05f0478cb90445b1bd23fb2084d983f9.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e0f500d713148e38461148786b0980f.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fcd.bin
5f6ad70637dd2609e837a5d246bf64f3686f32e61858011e0ea07a64b1bf8647		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FCD 5128 bytes
font_01_sfnt_off0000714b.bin
20e6a66c0913a5f54928d9bae30c273036812db32229c18260031c7e7e8c9305		 pdf-font-stream PDF embedded font (sfnt) at offset 0x714B 10544 bytes
font_02_sfnt_off00009559.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9559 4324 bytes

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