Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddc5586b52d95c1c…

MALICIOUS

PDF

38.5 KB Created: 2020-08-06 16:40:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af37f2151a24bd59c35a576a2651e3cf SHA-1: 33a99d1d4dc30f8e9e327cb695c3663dc3beebfe SHA-256: ddc5586b52d95c1cadc64650a9ae774a15dff25bbe8b0cca1ddd435162829930
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically 'https://ttraff.cc/pify?keyword=calculus+of+variations+gelfand+fomin+pdf'. This link is designed to redirect users to potentially harmful content. Additionally, the PDF exhibits characteristics of a link farm, embedding numerous external links, many of which point to PDF files hosted on various domains, including Shopify. 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.cc/pify?keyword=calculus+of+variations+gelfand+fomin+pdf
    • http://files.augustinepotter.com/uploads/1/3/1/4/131453251/9002928.pdf
    • http://files.mrdeleonardis.com/uploads/1/3/0/9/130969762/e85e6cff7f42.pdf
    • http://files.alanbermanart.com/uploads/1/3/1/3/131380052/7346113.pdf
    • https://cdn.shopify.com/s/files/1/0429/1801/9235/files/annexure_h_for_passport.pdf
    • https://cdn.shopify.com/s/files/1/0427/8901/1612/files/arch_linux_installation_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/6571/2535/files/how_to_make_a_fake_virus.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nuvororixepexovi.pdf
    • https://cdn.shopify.com/s/files/1/0428/5969/2198/files/mugen_character_database.pdf
    • https://cdn.shopify.com/s/files/1/0431/3592/6434/files/68140487003.pdf
    • https://cdn.shopify.com/s/files/1/0438/1458/4477/files/40k_codex_vk.pdf
    • https://cdn.shopify.com/s/files/1/0431/7596/8928/files/41624221460.pdf
    • https://cdn.shopify.com/s/files/1/0434/9670/2104/files/58674821450.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b52.bin
ccbd8fe5d720faa000190954d82fbdcd4b5c85996cd61b14c9df717c5587de5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B52 5440 bytes
font_01_sfnt_off00005dc2.bin
7d6ab8ea338b7282ca2be9d189e17aeceb7859ade721d1b858ddd50e0091a3d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DC2 9736 bytes
font_02_sfnt_off00007f1b.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F1B 4324 bytes

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