Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c38e3e67034b670…

MALICIOUS

PDF

52.0 KB Created: 2020-08-18 13:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5ded2377fc5260ce54c5301c6d24066 SHA-1: f4d3734070075144c3bbc35da229cba43295be03 SHA-256: 0c38e3e67034b6706fa0b309de808df4fe46bf587f3a67a49de0291e9d0dba22
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to potentially malicious redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to 'ttraff.ru', indicating a redirection attempt. The 'PDF_SEO_LINK_FARM' heuristic further suggests the document is designed to host numerous external links, likely for SEO manipulation or to distribute malware. No scripts were extracted, but the embedded links are the primary attack vector.

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=disney+fantasia+2000+questions+answers
    • http://lodiveg.edible-s.com/uploads/1/3/0/7/130776167/fabakesa.pdf
    • http://files.littlecog.co.uk/uploads/1/3/2/6/132695460/vilole.pdf
    • http://nulored.eliterateandlevelingup.com/uploads/1/3/2/8/132814930/5536056.pdf
    • http://files.ashleyparsonsyoga.com/uploads/1/3/2/7/132740415/newixebomufobezofawe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1121/1425/files/54662479015.pdf
    • https://cdn.shopify.com/s/files/1/0432/9147/6133/files/21157483300.pdf
    • https://cdn.shopify.com/s/files/1/0433/2896/2715/files/81499812485.pdf
    • https://cdn.shopify.com/s/files/1/0432/0677/0849/files/segurana_e_auditoria_de_sistemas.pdf
    • https://cdn.shopify.com/s/files/1/0431/2471/9773/files/bag_making_books.pdf
    • https://cdn.shopify.com/s/files/1/0433/8545/4757/files/gitosipawugutiwi.pdf
    • https://cdn.shopify.com/s/files/1/0434/8909/9938/files/65392262119.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1013/files/noguvev.pdf
    • https://cdn.shopify.com/s/files/1/0431/8140/8420/files/bamenepezafumerus.pdf
    • https://cdn.shopify.com/s/files/1/0435/7400/1825/files/sekumibutotuvixapik.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/liliaceae_plant_family.pdf
    • https://cdn.shopify.com/s/files/1/0428/3315/0118/files/86547775031.pdf
    • https://cdn.shopify.com/s/files/1/0434/7750/0056/files/fatores_ecologicos_bioticos_e_abioticos.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008cdb.bin
ccb2e5668e05384c6faf4581a65d5393996496c5f93b4350234357a94bb9b54f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CDB 5320 bytes
font_01_sfnt_off00009f1e.bin
2d5e8d1e82aea1d9f2543d338113e2fa35d878a8056df3161f3e0d6ebbde4aec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F1E 10616 bytes

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