Malicious PDF — malware analysis report

Static analysis result for SHA-256 f23c79a9472821e0…

MALICIOUS

PDF

46.2 KB Created: 2020-08-06 16:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85eb5dd3cddc19118f34afc6d348839a SHA-1: fb00969b47d17efe5be2119f9bb8f5a4c277f70f SHA-256: f23c79a9472821e0473d0625f41d15084fcf1b33c91674287de8998f9ddc0353
120 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic. This suggests the PDF is designed to redirect users to malicious content, likely for phishing or malware distribution. The presence of numerous links to external PDFs, including benign ones on Shopify, indicates a link farm strategy to potentially improve search engine ranking for malicious content.

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.com/pify?keyword=derivative+of+inverse+trigonometric+functions+proof+pdf
    • http://files.loganmona.co/uploads/1/3/1/4/131409794/zedunenimoleli.pdf
    • http://rinegeko.bigvisionnation.net/uploads/1/3/2/7/132741334/sedal.pdf
    • http://melel.yojimbocorp.com/uploads/1/3/1/4/131482975/b7c5f0110e42a8.pdf
    • http://files.dailynewsdump.com/uploads/1/3/1/4/131438211/doxodozoregiwope.pdf
    • https://cdn.shopify.com/s/files/1/0431/8789/6482/files/kotinikojulafot.pdf
    • https://cdn.shopify.com/s/files/1/0434/5554/5497/files/4795033414.pdf
    • https://cdn.shopify.com/s/files/1/0431/2920/8992/files/dotatuweri.pdf
    • https://cdn.shopify.com/s/files/1/0436/2698/7680/files/remosonakojo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5089/2440/files/kabodaxekone.pdf
    • https://cdn.shopify.com/s/files/1/0434/7029/1096/files/meluboloxati.pdf
    • https://cdn.shopify.com/s/files/1/0437/0504/1051/files/59702578489.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/nabaxamupala.pdf
    • https://cdn.shopify.com/s/files/1/0431/8347/2802/files/97091843917.pdf
    • https://cdn.shopify.com/s/files/1/0434/0849/0663/files/defekasomulotelepoluw.pdf
    • https://cdn.shopify.com/s/files/1/0429/6481/1935/files/95646969113.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_off00006a14.bin
19c621f897388155e8957055c1378bd9df4c4cd8456978b37ba0ef020c4a4eeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A14 5504 bytes
font_01_sfnt_off00007cc4.bin
c366ea9b7a0706cb20dad470399eeaabe3209600449b5a2eef6d4ebb511b3239		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CC4 14776 bytes

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