Malicious PDF — malware analysis report

Static analysis result for SHA-256 af55b95eaeb1523a…

MALICIOUS

PDF

41.2 KB Created: 2020-08-23 16:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7ceaaaecf1b0c43d740f974be01520e SHA-1: 9a5b136def4fb7939ab181130b0a09e17cbd6888 SHA-256: af55b95eaeb1523a3246a7590016cb36346c9e7f6bc42dc248f1ba4d29190b78
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=affine+geometry+textbook+pdf', suggesting a lure for users seeking a textbook. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm designed to improve search engine ranking for malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=affine+geometry+textbook+pdf
    • http://desexuvin.nanoredbiotechnology.com/uploads/1/3/1/6/131606490/2324451.pdf
    • http://rituro.romehospitalfoundation.org/uploads/1/3/1/3/131379803/vugir.pdf
    • https://cdn.shopify.com/s/files/1/0434/7094/6456/files/85156813294.pdf
    • https://cdn.shopify.com/s/files/1/0434/2788/9319/files/wow_trial_of_the_sea_lion.pdf
    • https://cdn.shopify.com/s/files/1/0436/2531/6514/files/nutosuvositusolinifudimi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1440/5793/files/32208348230.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8865/files/45936746615.pdf
    • https://cdn.shopify.com/s/files/1/0440/0057/5638/files/video_recording_software_for_mac_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/3526/1085/files/advertising_media_planning.pdf
    • https://cdn.shopify.com/s/files/1/0441/1860/5976/files/45449986342.pdf
    • https://cdn.shopify.com/s/files/1/0433/8486/4917/files/pufapaxazibexafod.pdf
    • https://cdn.shopify.com/s/files/1/0429/8424/3351/files/tcs_off_campus_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/47475247643.pdf
    • https://cdn.shopify.com/s/files/1/0431/7016/8986/files/pasipelevomeve.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_off00006353.bin
fa372e13e429de91062a454b03b941c8f4dcb4d59edc584f9973b9a1d52f07ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6353 5304 bytes
font_01_sfnt_off00007552.bin
31e943ff93f50e8e407cef59da2c82c0e57579034fb1538b385662cc478ae23d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7552 10196 bytes

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