Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a6666fc1c5bdec…

MALICIOUS

PDF

39.6 KB Created: 2020-08-22 17:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a084789ade0d4405ce9535cd7342fc9b SHA-1: 54e2ed485ef5ba48b986777eaaa1332ffaba1896 SHA-256: 37a6666fc1c5bdec2e889eeb6730c7b8d8705490bb4bc2c0a1e6eb98e18d5e9b
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'Printable check register form free' and the malicious URL, suggesting a lure to trick users into clicking the link. 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.com/pify?keyword=printable+check+register+form+free
    • http://files.mrmacbiblebook1.com/uploads/1/3/0/7/130738696/4203a6bcb.pdf
    • http://files.headandneckultrasound.com/uploads/1/3/1/4/131453031/betijuge.pdf
    • https://cdn.shopify.com/s/files/1/0428/5261/4311/files/3d_action_games_apk_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/2253/2251/files/lspdfr_callout_manager.pdf
    • https://cdn.shopify.com/s/files/1/0434/0567/2597/files/define_math.pdf
    • https://cdn.shopify.com/s/files/1/0436/4691/0624/files/zarowubikapakebane.pdf
    • https://cdn.shopify.com/s/files/1/0434/6714/5366/files/best_dance_video_pagalworld.pdf
    • https://cdn.shopify.com/s/files/1/0436/0631/1070/files/96599255386.pdf
    • https://cdn.shopify.com/s/files/1/0433/9888/9635/files/32614848588.pdf
    • https://cdn.shopify.com/s/files/1/0432/3124/8541/files/46475034483.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31931154882.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_off00005bc7.bin
2292830a5ba06a078b181fb491db716ee815aebeb71ffa86c4afcdd970b83ac3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BC7 5500 bytes
font_01_sfnt_off00006e4a.bin
d9de99b191417e26956651b940420218cae7ff28327c81c1ab87791019348a73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E4A 10340 bytes

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