Malicious PDF — malware analysis report

Static analysis result for SHA-256 8346e72793eb7acf…

MALICIOUS

PDF

51.5 KB Created: 2020-08-18 14:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3b19d5ebac428166088dff571b98d3b SHA-1: 43852ddbb8078f786c951cb57dc37d6267ef8a44 SHA-256: 8346e72793eb7acfd0b6f92da52d29369f7fcc184d5a2d2e89a89441b679001e
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a poem, intended to lure users to a malicious website. The PDF also contains a large number of external links, many hosted on Shopify, which is characteristic of SEO link farm abuse. 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.com/pify?keyword=alexander+pushkin+poemas+pdf
    • http://files.ninelivestwine.com/uploads/1/3/0/8/130874629/vezik_gunefitotokek.pdf
    • https://cdn.shopify.com/s/files/1/0432/9648/9632/files/adpic_omc.pdf
    • https://cdn.shopify.com/s/files/1/0427/9818/6652/files/dafot.pdf
    • https://cdn.shopify.com/s/files/1/0433/5976/4634/files/dewalt_dw735_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/25781613666.pdf
    • https://cdn.shopify.com/s/files/1/0429/6251/8182/files/zazefomuvivitemejexileji.pdf
    • https://cdn.shopify.com/s/files/1/0431/2068/9306/files/xavojisifuroruzi.pdf
    • https://cdn.shopify.com/s/files/1/0435/0276/4184/files/74982257534.pdf
    • https://cdn.shopify.com/s/files/1/0432/9937/3214/files/bloody_roar_game_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0439/6387/5486/files/41620095767.pdf
    • https://cdn.shopify.com/s/files/1/0441/4416/5016/files/37798798323.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_off000086cb.bin
3ec15b03364f03934fab54464c1f226eedd7a3c19b96f045133c8d7d02086a76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86CB 5400 bytes
font_01_sfnt_off000098fb.bin
f11d9181e0b623ac0d15fb5b70616cbc7cc6317245083d71db74f6d67aba7378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98FB 12720 bytes

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