Malicious PDF — malware analysis report

Static analysis result for SHA-256 3260612927049fc8…

MALICIOUS

PDF

41.0 KB Created: 2020-09-11 05:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0180d66fff1ecce90ae438e166ad0fdd SHA-1: ae6c9b685b1be3611da273ec02751b234a482c16 SHA-256: 3260612927049fc836c3cd157dd0f5f7645523f098f3696397a2908300c476b1
150 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files, a technique often used for SEO poisoning or to redirect users to malicious sites. One critical heuristic identified a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'converting fraction to percent word problems worksheet' and includes the malicious URL, suggesting a lure to trick users into clicking the link. No scripts were extracted from this sample.

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=converting+fraction+to+percent+word+problems+worksheet
    • http://jenefodo.jpadventures.com/uploads/1/3/1/4/131406515/xoxoxojovu.pdf
    • http://files.neuro-flowgroup.com/uploads/1/3/1/6/131637656/4089322.pdf
    • http://metutefaf.sciencetheearth.com/uploads/1/3/2/8/132815004/5562517.pdf
    • http://files.blueridgeperformingarts.com/uploads/1/3/1/4/131407493/zetedazerof.pdf
    • http://rodegabel.stonycreekleonbergers.com/uploads/1/3/1/0/131070420/313236.pdf
    • http://wifedab.oldnytours.com/uploads/1/3/1/6/131606666/2846926.pdf
    • http://kevot.loveaboveallelse.org/uploads/1/3/2/8/132814838/997c9a66b6b9b.pdf
    • https://static.usrfiles.com/ugd/3f8d85_bf4caa0ccf0d441d84f8c58bb248d633.pdf
    • https://static.usrfiles.com/ugd/b8c837_30a319ecbfb8443d8351d97a3c243ee1.pdf
    • https://static.usrfiles.com/ugd/f14cf6_3a7d7c0209b642bba0e8b25762fb6149.pdf
    • https://static.usrfiles.com/ugd/b8c837_9272e80b060e4b27adc9b0f291a28513.pdf
    • https://static.usrfiles.com/ugd/9b33c5_b4e0dad9f4ae46f28c4d896338fc8cf5.pdf
    • https://static.usrfiles.com/ugd/d43733_3ed887b922794e88a54402823a9d996b.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_off00005fbe.bin
0d32b743488ea1238892cc0d3601024f72834b7e8e5a987a981d8f563b2baf89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FBE 5832 bytes
font_01_sfnt_off00007384.bin
a0780a9b37582957a5d63c1620c2f841dd3a4ca77af7cf855c3570c65574e285		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7384 10376 bytes

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