Malicious PDF — malware analysis report

Static analysis result for SHA-256 f817842343e5804d…

MALICIOUS

PDF

38.4 KB Created: 2020-08-21 20:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 123c2026a265e9edc0ca5b1c886668a7 SHA-1: 5635fbb77dca34f11d4422de23313197a609c32b SHA-256: f817842343e5804db71dc9bb87e311047e35dddd3dd9aee39196e2ab47ccae76
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one pointing to a known malicious redirector. The document body text, though heavily obfuscated, contains references to 'vcredist_x64 windows 8.1' and a URL that appears to be part of a link farm designed to attract users searching for software downloads. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=vcredist_x64++windows+8.+1
    • http://nanusexu.davisionentertainment.com/uploads/1/3/2/6/132695578/d55051324ca41e.pdf
    • http://files.powerlandrealty.com/uploads/1/3/2/6/132681317/28c3cd58.pdf
    • http://taxes.n3vem.com/uploads/1/3/0/8/130813059/tovezolegi.pdf
    • http://files.myhealthsupplies.co.uk/uploads/1/3/1/3/131380029/xesudulafenoxe.pdf
    • https://cdn.shopify.com/s/files/1/0434/2182/7222/files/tank_trouble_deathmatch.pdf
    • https://cdn.shopify.com/s/files/1/0427/9736/7452/files/3d_consortium.pdf
    • https://cdn.shopify.com/s/files/1/0431/2160/6817/files/the_glass_floor_stephen_king.pdf
    • https://cdn.shopify.com/s/files/1/0431/0381/3781/files/nasumupoje.pdf
    • https://cdn.shopify.com/s/files/1/0430/8035/1897/files/rapogonop.pdf
    • https://cdn.shopify.com/s/files/1/0430/4194/7801/files/13507884884.pdf
    • https://cdn.shopify.com/s/files/1/0434/6888/2072/files/1117943140.pdf
    • https://cdn.shopify.com/s/files/1/0434/0069/1868/files/verbals_worksheet.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_off00005808.bin
e8e76c1d89b96e95aaf6727357021cf239c6ca2b9be3384c6f4966acaa88fb27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5808 5368 bytes
font_01_sfnt_off00006a8b.bin
8ddc8bb20edc5df48346b96644d5aa89356874f34a74635b221f9baf3ef8541d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A8B 10052 bytes

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