Malicious PDF — malware analysis report

Static analysis result for SHA-256 c98b7f2cfb3d992e…

MALICIOUS

PDF

50.2 KB Created: 2020-08-25 15:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab8c47fec911b6f2ae5d2b8c0f566134 SHA-1: 2e22569a0e3c8145ecb7ebeaf40a8109b11b5713 SHA-256: c98b7f2cfb3d992e8e7cfb87c13e215f381cfa07fb39c84b61fdb48dc53ddc0a
150 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a significant number of embedded links. One of these links, https://ttraff.ru/pify?keyword=ambiguous+sentences+pdf, points to known malicious redirector infrastructure. The document body appears to be obfuscated or corrupted, but the presence of numerous links, including the malicious redirector, strongly suggests an intent to lure users to harmful external sites.

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.ru/pify?keyword=ambiguous+sentences+pdf
    • http://files.freerangeworship.com/uploads/1/3/1/6/131606397/4fd160ac10dfad3.pdf
    • http://files.thefurniturelady.com/uploads/1/3/2/6/132681985/lilevejatofasu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1329/9620/files/34801983166.pdf
    • https://cdn.shopify.com/s/files/1/0431/7862/3138/files/ultralight_backpacking_checklist.pdf
    • https://cdn.shopify.com/s/files/1/0459/1832/2839/files/52505254629.pdf
    • https://cdn.shopify.com/s/files/1/0437/6104/1559/files/6371279412.pdf
    • https://cdn.shopify.com/s/files/1/0429/6232/1571/files/zonipoletik.pdf
    • https://cdn.shopify.com/s/files/1/0428/5811/9334/files/vasigemeviz.pdf
    • https://cdn.shopify.com/s/files/1/0461/7135/7336/files/38094826442.pdf
    • https://cdn.shopify.com/s/files/1/0438/0606/4801/files/47457268054.pdf
    • https://cdn.shopify.com/s/files/1/0435/8324/2401/files/population_cartogram_world_crossword_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/9694/0448/files/toefl_listening_time_to_answer.pdf
    • https://cdn.shopify.com/s/files/1/0437/3967/6821/files/astronomy_eric_chaisson.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_off0000879e.bin
d150279b7a947077bfbdacce97b0909ffcf62818386f0eb4a5f919cea61b57c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x879E 5268 bytes
font_01_sfnt_off0000997c.bin
4c8b0b1dbaf002e488bdfa6023f3d4f4475f3ca03fcc9d722e5ed763c5041810		 pdf-font-stream PDF embedded font (sfnt) at offset 0x997C 10176 bytes

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