Malicious PDF — malware analysis report

Static analysis result for SHA-256 d73cab85aa46162c…

MALICIOUS

PDF

41.6 KB Created: 2020-08-20 23:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc1161fa2540411c41e5cd92ea307023 SHA-1: fb01519ef80ac9238a2b60800ed4d8384adeb3fe SHA-256: d73cab85aa46162c58495698dd85b6bc1f3893b626ac1dd3ef10fc2cb17edfec
150 Risk Score

Malware Insights

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

This PDF file contains numerous links, including one pointing to a known malicious redirector at 'https://ttraff.cc/pify?keyword=original+audio+track+for+movies'. The document body, though heavily obfuscated, also contains this URL and references to 'original audio track for movies', suggesting a lure. The presence of a link farm and the ML classifier's high confidence further support malicious intent. The primary attack pattern involves redirecting 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.cc/pify?keyword=original+audio+track+for+movies
    • http://files.fernwehfeels.com/uploads/1/3/1/3/131384374/2844991.pdf
    • http://vubidamob.nbpeipublichealth.ca/uploads/1/3/1/1/131164538/33253a789d.pdf
    • https://cdn.shopify.com/s/files/1/0435/8144/0168/files/gafejus.pdf
    • https://cdn.shopify.com/s/files/1/0430/6858/8194/files/zuzeruvixusiwot.pdf
    • https://cdn.shopify.com/s/files/1/0432/1561/8203/files/wefazegesenupavavuvu.pdf
    • https://cdn.shopify.com/s/files/1/0430/1501/2511/files/88041913268.pdf
    • https://cdn.shopify.com/s/files/1/0437/8394/6397/files/68479242232.pdf
    • https://cdn.shopify.com/s/files/1/0435/2560/3488/files/4858657509.pdf
    • https://cdn.shopify.com/s/files/1/0431/6859/6123/files/american_flag_coloring_pages.pdf
    • https://cdn.shopify.com/s/files/1/0429/3797/4940/files/xeberixanu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4441/3341/files/traditional_bowyers_bible.pdf
    • https://cdn.shopify.com/s/files/1/0434/3876/8294/files/30060358422.pdf
    • https://cdn.shopify.com/s/files/1/0433/9816/8743/files/arquitectura_empresarial_zachman.pdf
    • https://cdn.shopify.com/s/files/1/0429/2801/3471/files/83331983187.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_off000063e1.bin
d9c447b3635dbebe055153e0e6831e528340615922e3c84de313ca09de3aa506		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63E1 5492 bytes
font_01_sfnt_off00007687.bin
7192ab930f88ce05945de208f45afbfe233681cc849f84c5b13770ab9c297197		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7687 10152 bytes

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