Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5833d453ab6e0c9…

MALICIOUS

PDF

34.8 KB Created: 2020-08-30 01:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bab0f6980f9b2d11b93763834f31af71 SHA-1: d82ba3b74121e149a55a628c6fb4b227dcac3b7f SHA-256: a5833d453ab6e0c908fbdf731f518420c8e0273a0602cfa2a185a22e38cdefde
150 Risk Score

Malware Insights

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

The PDF file contains embedded links that lead to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, appears to be a lure related to 'dragonwings test questions and answers'. The ML classifier also strongly indicated maliciousness. The primary attack vector is likely social engineering via a deceptive document, directing users to malicious infrastructure.

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=dragonwings+test+questions+and+answers
    • https://cdn.shopify.com/s/files/1/0452/0719/1701/files/xedinupeputobodobemu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1179/2286/files/45331462933.pdf
    • https://cdn.shopify.com/s/files/1/0428/9550/7615/files/35754726234.pdf
    • https://static.usrfiles.com/ugd/b8c837_a7039571bd2d4e44b14dbe5888f8db66.pdf
    • https://cdn.shopify.com/s/files/1/0457/9016/7206/files/nufuginopinilelagor.pdf
    • https://cdn.shopify.com/s/files/1/0436/3363/9584/files/challenges_in_teaching_english_language_learners_in_the_classroom.pdf
    • https://cdn.shopify.com/s/files/1/0431/5414/5444/files/iteration_vs_recursion.pdf
    • https://cdn.shopify.com/s/files/1/0431/5345/7320/files/dolivab.pdf
    • https://cdn.shopify.com/s/files/1/0432/8656/0936/files/xaworopin.pdf
    • https://cdn.shopify.com/s/files/1/0434/0360/8214/files/wiwuli.pdf
    • https://cdn.shopify.com/s/files/1/0465/3849/0015/files/ruzixuriduripoletit.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_off00004b36.bin
905dc39b727a0f650d3f7052bd761ed177a2edbce892a455f2eb0068fa915c6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B36 5176 bytes
font_01_sfnt_off00005ce1.bin
b1582920020ad3c48ede3db900a9ae9ecab5daf65b347641938d5e34856e6033		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CE1 9920 bytes

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