Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ce08383773b00c…

MALICIOUS

PDF

62.2 KB Created: 2020-08-11 07:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 167bcc72c98fe4ba17a6cc7e79ee4566 SHA-1: 6623c882460d2069ec3341885a40cdad1275888e SHA-256: 91ce08383773b00cc4de036452dce1821c87df2f885ca13b17c0d3a19d89e0d7
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, includes the URL 'https://ttraff.ru/pify?keyword=warhammer+40k+8th+edition+xenos+codex+pdf', suggesting a lure related to a game codex. The presence of a large number of links to Shopify domains, some of which are marked as benign, alongside the malicious redirector, indicates a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier 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.ru/pify?keyword=warhammer+40k+8th+edition+xenos+codex+pdf
    • http://files.otherworldlyart.com/uploads/1/3/1/4/131453598/suwokad.pdf
    • http://files.yoyomamadesigns.com/uploads/1/3/0/9/130969312/xavezitorepugi.pdf
    • http://files.pluckings.com/uploads/1/3/1/6/131606174/bozefenipedadofu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6993/1673/files/85608321294.pdf
    • https://cdn.shopify.com/s/files/1/0433/2657/0664/files/30_pt_buck_song.pdf
    • https://cdn.shopify.com/s/files/1/0427/4431/6070/files/57873530277.pdf
    • https://cdn.shopify.com/s/files/1/0431/4729/6922/files/66038210649.pdf
    • https://cdn.shopify.com/s/files/1/0429/1959/2103/files/amharic_books_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/7937/6798/files/75215642481.pdf
    • https://cdn.shopify.com/s/files/1/0436/9770/1032/files/fubiwufo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51268900441.pdf
    • https://cdn.shopify.com/s/files/1/0429/9259/9193/files/delisoxugawipizeja.pdf
    • https://cdn.shopify.com/s/files/1/0429/3738/5123/files/jurnal_gymnospermae.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/budupitifeguk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009a0d.bin
c9b5d7b0d1d91457dee3f0db58edab76d08979c3320eeef053d9141a0face075		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A0D 5720 bytes
font_01_sfnt_off0000ad68.bin
ceac983335bb853c0edace09138e8a4a5b2af2691fa0ed353678b11baedde98d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD68 15452 bytes
font_02_sfnt_off0000dd6c.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6C 4324 bytes

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