Malicious PDF — malware analysis report

Static analysis result for SHA-256 829535f928c1a8e3…

MALICIOUS

PDF

39.4 KB Created: 2020-08-12 15:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff3adc5d9143bd64e5baa0804fa5619c SHA-1: 1e868bc1aa0a95c89e46fc1814a63ca0c78630d9 SHA-256: 829535f928c1a8e381a42cc0a6913bf4d14dff9713c2cf5b00c2211d04be2949
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to a 'survival guide' and includes the malicious redirector URL. The ML classifier strongly flagged this PDF as malicious, indicating it's part of a link farm or SEO spam campaign designed to redirect users to malicious sites.

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.ru/pify?keyword=accident+and+emergency+radiology+a+survival+guide+pdf+download
    • http://files.johngetsmariad.com/uploads/1/3/1/6/131637009/74e9d18ec86f14d.pdf
    • http://files.fringeelectronics.com/uploads/1/3/0/9/130969703/debixipuke.pdf
    • http://zigurom.the1000monkeys.com/uploads/1/3/1/3/131380429/1822582.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/4774/6710/files/safowonevarusudijuzano.pdf
    • https://cdn.shopify.com/s/files/1/0430/2854/5693/files/xilotovijoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/3019/2039/files/zupivazuwivekugemuwuwu.pdf
    • https://cdn.shopify.com/s/files/1/0428/7663/3247/files/dedicated_clean_ballast_tanks.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/rezozozexeten.pdf
    • https://cdn.shopify.com/s/files/1/0428/4429/1228/files/51435495451.pdf
    • https://cdn.shopify.com/s/files/1/0435/3051/8682/files/50235879741.pdf
    • https://cdn.shopify.com/s/files/1/0430/9660/4825/files/xefeserakijunogovobiv.pdf
    • https://cdn.shopify.com/s/files/1/0430/7389/6602/files/16567713016.pdf
    • https://cdn.shopify.com/s/files/1/0430/6881/7569/files/51274026494.pdf
    • https://cdn.shopify.com/s/files/1/0431/6954/6395/files/44884984043.pdf
    • https://cdn.shopify.com/s/files/1/0429/8558/6849/files/sazefomagurem.pdf
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/176335064.pdf
    • https://cdn.shopify.com/s/files/1/0435/3723/6119/files/xarofifovizaxu.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ca8.bin
448544067a0a5abc4f93170421f544a7b8ab4b7cf3fd4080005efaab1cf4d312		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CA8 5600 bytes
font_01_sfnt_off00005fa4.bin
6c9c0ffd065e815440b6e7571a0ca15d4bb75dcee2b31a7c97b5bf089d1ba164		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FA4 10124 bytes
font_02_sfnt_off000081cd.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81CD 4324 bytes

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