Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6025bc9410d1631…

MALICIOUS

PDF

34.8 KB Created: 2020-08-29 15:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b973b60a275b857aaa30d06122015a7e SHA-1: 43af1f6da982bbe05fd69de428e1b7db3559ba56 SHA-256: a6025bc9410d16313a437423ef5525baff9b72f673b2fe99e195a5ac4ebfaabb
150 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=sas+certification+prep+guide+base+pr'. This URL is likely part of a phishing campaign or a malware distribution scheme. The document also exhibits characteristics of a link farm, with numerous embedded URLs, many of which point to 'static.usrfiles.com'. The ML classifier also strongly flagged this PDF as malicious.

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/wix?keyword=sas+certification+prep+guide+base+pr
    • https://static.usrfiles.com/ugd/b8c837_92460ea311c6494fae54c155528fd7d6.pdf
    • https://static.usrfiles.com/ugd/b8c837_61f6670e4eb74da582f67b161bb55618.pdf
    • https://static.usrfiles.com/ugd/b8c837_16a9b2edcccc4b689a4edd98b324b431.pdf
    • https://static.usrfiles.com/ugd/b8c837_99fe961d527c40e48348b34a240f6a04.pdf
    • https://static.usrfiles.com/ugd/b8c837_07ae4d5ac7b649f79233036d94ac269c.pdf
    • https://static.usrfiles.com/ugd/b8c837_73da8329b14d4ff7b43e116734a409de.pdf
    • https://static.usrfiles.com/ugd/b8c837_36175126d85041f993b9c1f4e066a536.pdf
    • https://static.usrfiles.com/ugd/b8c837_aa3fb086e5084a0b94d9a5591e085945.pdf
    • https://cdn.shopify.com/s/files/1/0464/6938/2302/files/subordinating_conjunctions_worksheets_for_grade_5.pdf
    • https://cdn.shopify.com/s/files/1/0433/0238/7867/files/vazodobopuxala.pdf
    • https://cdn.shopify.com/s/files/1/0435/5496/3617/files/timerurozefulupuvisijo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2956/9434/files/55010757697.pdf
    • https://cdn.shopify.com/s/files/1/0438/5023/6054/files/nakasej.pdf
    • https://cdn.shopify.com/s/files/1/0428/7217/6796/files/vemijanetesokodokurekebu.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_off000049df.bin
354ebb3d9894f8c31203a0e86c3711e4763e9b91ff2a3c0b8691f36179a98f95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49DF 5532 bytes
font_01_sfnt_off00005ca5.bin
420503becae8fc2b0cb7ff6447e9fba4e4f7f132dba60f76666aa995ee7ed7f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CA5 9936 bytes

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