Malicious PDF — malware analysis report

Static analysis result for SHA-256 473fd44cf1ba087c…

MALICIOUS

PDF

54.7 KB Created: 2020-11-06 06:52:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d07d97fcf14fee37b2795e659cc6b9a SHA-1: 9542acb3f9b61506f52c29f70a925d54ce6534cc SHA-256: 473fd44cf1ba087cc7007fbfc00a87fad9c5c35203b6464c84cd767ff98cdbac
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF SEO link farm. The primary external link points to a URL that appears to be part of a keyword-stuffed SEO strategy. While no scripts were explicitly extracted, the presence of numerous external links and the ML classifier's high confidence suggest a malicious intent, likely to redirect users to malicious sites or for SEO manipulation. The document body itself is heavily obfuscated and contains embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/123?keyword=shroud+hearth+barrow+puzzle+bridge
    • https://cdn-cms.f-static.net/uploads/4428054/normal_5f9d71fe04c56.pdf
    • https://jasasenud.weebly.com/uploads/1/3/4/1/134131975/69e0a0b6c891.pdf
    • https://detosujedeke.weebly.com/uploads/1/3/4/3/134371576/4848818.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/fofeguj/66004961299.pdf
    • https://s3.amazonaws.com/kulinisokakewi/37867099651.pdf
    • https://s3.amazonaws.com/xanebavifamopez/appetizer_recipes_book.pdf
    • https://s3.amazonaws.com/falufusu/dance_plus_5_2019.pdf
    • https://uploads.strikinglycdn.com/files/994a2498-4dc3-4d57-9483-fb87e5cf6675/ice_boy_and_watergirl_2.pdf
    • https://uploads.strikinglycdn.com/files/afef8f63-4899-4335-b175-4e0b905b1a90/dd_air_genasi_monk.pdf
    • https://s3.amazonaws.com/boxujetanonikuv/2423300694.pdf
    • https://s3.amazonaws.com/pewebopufupe/xatozuvakamew.pdf
    • https://s3.amazonaws.com/varolexexus/naporad.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_off00008751.bin
1de7e4bce3d3c9fca10319014dbad5c5062734b4ff2292933b9846e6cc524386
pdf-font-stream PDF embedded font (sfnt) at offset 0x8751 5204 bytes
font_01_sfnt_off0000992b.bin
00914017f400de59b1020839d955a6725b3c116ca946cef96c4786ccc791a4d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x992B 10892 bytes
font_02_sfnt_off0000be48.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE48 4324 bytes