Malicious PDF — malware analysis report

Static analysis result for SHA-256 c405a196bc121b77…

MALICIOUS

PDF

44.7 KB Created: 2020-08-25 15:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a2a622d936b5c974d07f7dd63960087 SHA-1: 4a1431eb58792a64014964fa6e6dc96ffbb5bcaf SHA-256: c405a196bc121b77fb8d40cc6780ae64bf7e84e6211f67be7e310275354d7bb7
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics, indicating a deliberate attempt to redirect users to malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=european+hernia+society+guidelines+2015
    • http://files.rainonmain.com/uploads/1/3/1/4/131406592/nalivizatefofijez.pdf
    • http://pavurov.fromtheeasel.net/uploads/1/3/2/6/132681670/narekib.pdf
    • https://cdn.shopify.com/s/files/1/0431/5247/4267/files/12014805668.pdf
    • https://cdn.shopify.com/s/files/1/0430/5816/7959/files/30278595759.pdf
    • https://cdn.shopify.com/s/files/1/0434/1664/9890/files/reading_practice_ielts.pdf
    • https://cdn.shopify.com/s/files/1/0433/1126/7990/files/basant_maheshwari.pdf
    • https://cdn.shopify.com/s/files/1/0431/0840/1316/files/difference_between_analog_and_digital_computer.pdf
    • https://cdn.shopify.com/s/files/1/0430/8126/9401/files/fuwisu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0335/5034/files/libalizosozupimogi.pdf
    • https://cdn.shopify.com/s/files/1/0433/7955/6504/files/gofelesaroteluduvumegoz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/65069223210.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_off00006fcd.bin
8c04a9bbf1782c26411d63e5ffa633d287d2cd3d084d905002f362e65459d587		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FCD 5844 bytes
font_01_sfnt_off000083bd.bin
a5d1bff4dacf626a12aaddfe57eb7172cee40625daea10437ece912e8f13278f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83BD 10088 bytes

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