Malicious PDF — malware analysis report

Static analysis result for SHA-256 0246bfbfdd1f14a6…

MALICIOUS

PDF

49.0 KB Created: 2020-07-28 10:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34775ceb681e65c7c8da2782df2e6833 SHA-1: 796057cca26959e00beeef23af0b69c35a5be085 SHA-256: 0246bfbfdd1f14a6a91b6f0e56203c6477ca2fb68eced5d09b7a247b5c8cab98
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute further 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=bokeh+filter+photoshop+free
    • http://files.golovkova.org/uploads/1/3/1/3/131381919/8004192.pdf
    • http://files.reconnectingcolumbus.com/uploads/1/3/1/0/131070689/c0cd9a483ad1f6.pdf
    • http://files.realitynconsciousness.com/uploads/1/3/1/4/131437563/dekupenegiri.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7663/2214/files/94571982555.pdf
    • https://cdn.shopify.com/s/files/1/0429/8542/2997/files/xusaf.pdf
    • https://cdn.shopify.com/s/files/1/0430/4817/3722/files/kotejemuve.pdf
    • https://cdn.shopify.com/s/files/1/0434/0357/5447/files/lutezejufir.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ganisififado.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xoxolesusoziviro.pdf
    • https://cdn.shopify.com/s/files/1/0436/4579/6512/files/jizemuxafesox.pdf
    • https://cdn.shopify.com/s/files/1/0435/1688/7192/files/lixerulitogapajulazaxoj.pdf
    • https://cdn.shopify.com/s/files/1/0429/9846/4661/files/riroborijitewowukinir.pdf
    • https://cdn.shopify.com/s/files/1/0435/6187/7665/files/kavepejurovubedezobejo.pdf
    • https://cdn.shopify.com/s/files/1/0437/7188/7767/files/4164128210.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_off000084d9.bin
34da07a88862831867ec58f9c11d3e25da7724e288515317826132849e986363
pdf-font-stream PDF embedded font (sfnt) at offset 0x84D9 4576 bytes
font_01_sfnt_off00009475.bin
cc9cc03666469292cab77cb6dd0d3a6c73fe8d0006d4d46d1227729246568d1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x9475 10196 bytes