Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2402a5021119dd8…

MALICIOUS

PDF

42.2 KB Created: 2020-08-06 01:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d968abb0d28fe7cbe8cf2a9cd70a87cd SHA-1: 300c9522d16e8658792cd60a1c979fe29c1af0f4 SHA-256: e2402a5021119dd876575dd4811b6ed8e8989c3167f3ccf2655902638a84244c
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to domains associated with link farms and redirectors. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a URL leading to ttraff.ru, indicating a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of the URL in the body text and the numerous embedded links suggest the primary intent is to lure users to external, potentially 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=belladonna+alkaloids+davis+pdf
    • http://files.awakennirvana101.com/uploads/1/3/2/7/132740764/4436485.pdf
    • http://files.elizabeth-lynx.com/uploads/1/3/1/3/131379792/tabotinuronebisok.pdf
    • http://kegifaxi.instar-program.org/uploads/1/3/1/4/131453109/464c30f1bcca87.pdf
    • http://wamewox.inventingchange.net/uploads/1/3/1/8/131856158/mibovitaneli_xozupiwepamet.pdf
    • https://cdn.shopify.com/s/files/1/0430/2507/2282/files/wifavefapaj.pdf
    • https://cdn.shopify.com/s/files/1/0434/6383/5814/files/favejidujedimudosi.pdf
    • https://cdn.shopify.com/s/files/1/0448/1266/4989/files/python_curses_examples.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/75619128339.pdf
    • https://cdn.shopify.com/s/files/1/0431/0525/5577/files/46846516204.pdf
    • https://cdn.shopify.com/s/files/1/0434/5180/9957/files/20307592736.pdf
    • https://cdn.shopify.com/s/files/1/0429/8221/1735/files/21590489198.pdf
    • https://cdn.shopify.com/s/files/1/0433/4898/3959/files/ashrae_handbook_of_fundamentals.pdf
    • https://cdn.shopify.com/s/files/1/0433/7496/8986/files/pdf_joindre_un_fichier.pdf
    • https://cdn.shopify.com/s/files/1/0429/1490/6279/files/zexilizorufitubis.pdf
    • https://cdn.shopify.com/s/files/1/0437/2915/8295/files/validity_test_definition.pdf
    • https://cdn.shopify.com/s/files/1/0433/4485/5195/files/55497832381.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_off0000688e.bin
2cd277a23bda838d9b077b1bceb64af6685c0dd977b75c11e7ccf32eacdb0835		 pdf-font-stream PDF embedded font (sfnt) at offset 0x688E 5112 bytes
font_01_sfnt_off00007a15.bin
3ed7f464a619b699c9d6ebe379cf4377c6f90bfae8e812d43c3348eff8c9695c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A15 9900 bytes

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