Malicious PDF — malware analysis report

Static analysis result for SHA-256 55672c0f5e0cd991…

MALICIOUS

PDF

45.7 KB Created: 2020-08-28 13:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01cbc2f3d56f1579033281c9f45691ed SHA-1: 2f122eb9af908f839163181586c8de71e25c3d4d SHA-256: 55672c0f5e0cd9911658cfec6852a35cd8b8b17b4a245b354c3c56bae6bb2800
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 of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO poisoning. One critical heuristic identified a direct link to a known malicious redirector, ttraff.link, which is used to lure victims with a fake 'shrm assurance of learning study guide'. The document body, though heavily obfuscated, contains the same lure text and the malicious redirector URL, confirming the intent to trick users into visiting a malicious site.

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.link/pify?keyword=shrm+assurance+of+learning+study+guide
    • http://files.elmsband.com/uploads/1/3/1/4/131438389/juvujizeke-xidonaj-bujalutigotoxuj-nevidapixesat.pdf
    • http://kexufoti.ninacoffaro.com/uploads/1/3/0/7/130776487/a4a7d2bbd3089b.pdf
    • http://files.wellnesspluscharleston.com/uploads/1/3/1/3/131379231/c8f50c.pdf
    • https://cdn.shopify.com/s/files/1/0427/9762/9596/files/tajebipofuzofun.pdf
    • https://cdn.shopify.com/s/files/1/0430/0134/8255/files/26915524585.pdf
    • https://cdn.shopify.com/s/files/1/0427/6859/7158/files/napuruwope.pdf
    • https://cdn.shopify.com/s/files/1/0432/2285/9944/files/25618955239.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kemulubu.pdf
    • https://cdn.shopify.com/s/files/1/0450/9194/6661/files/avery_8460_template.pdf
    • https://cdn.shopify.com/s/files/1/0438/5567/5552/files/my_friend_martin_video_online.pdf
    • https://cdn.shopify.com/s/files/1/0437/4996/5985/files/wow_engineering_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/9612/9192/files/leluturareleg.pdf
    • https://cdn.shopify.com/s/files/1/0438/0357/4434/files/pharmaceutical_capsules_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/2314/6906/files/52473131839.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_off000071d2.bin
cb7f75c464a37fc423f204e1ffcfc48638447dfd49283d95e6a2ec9b96b5bcb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71D2 5640 bytes
font_01_sfnt_off000084d2.bin
4cde573409add52134c6d7de082ff0f7591936fa293c92cbf3cfd6fe7eccafc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84D2 10844 bytes

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