Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6eb4a3abec610bd…

MALICIOUS

PDF

48.8 KB Created: 2020-07-21 20:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25dcc4a17ea24f5a371f6999f760d1ea SHA-1: c0262c7ec6c561bb1c876f2f887cd04b0b6e121a SHA-256: a6eb4a3abec610bd6b71661e96640fe6ff0460c157efa7818026d669f94de1df
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF file contains multiple embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to 'legislative assembly french revolution pdf'. The presence of numerous external links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to drive traffic to malicious sites. The ML classifier also strongly indicated maliciousness.

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/wb?keyword=legislative%20assembly%20french%20revolution%20pdf
    • http://files.empressboatclub.org/uploads/1/3/1/4/131452741/kojezufadogepe.pdf
    • http://files.dassiedahan-author.com/uploads/1/3/1/4/131436971/wixodasa.pdf
    • http://files.eclexica.studio/uploads/1/3/1/0/131070327/dizirile_fozejevufexiz_kenanidado.pdf
    • http://files.dawnstastyspoon.com/uploads/1/3/0/9/130968920/bajatutudofa_ponosiv_tonavo.pdf
    • http://files.christineharvelltherapy.com/uploads/1/3/1/4/131453206/3776081.pdf
    • http://files.dawnstastyspo
    • https://cdn.shopify.com/s/files/1/0434/7166/7360/files/5991735640.pdf
    • https://cdn.shopify.com/s/files/1/0431/4087/4408/files/tatipaponubuxisi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/13002849425.pdf
    • https://cdn.shopify.com/s/files/1/0429/1058/0903/files/zilinesabojasomo.pdf
    • https://ripefobol.files.wordpress.com/2020/07/37069746913.pdf
    • https://gozofenu.files.wordpress.com/2020/07/wavejoludori.pdf
    • https://tokatoxosi.files.wordpress.com/2020/06/97153128437.pdf
    • https://rerazudo.files.wordpress.com/2020/07/viwuvixaxidoteni.pdf
    • https://cdn.shopify.com/s/files/1/0433/3735/1326/files/tagakefimugad.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96226605796.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/45469667997.pdf
    • https://cdn.shopify.com/s/files/1/0432/2823/3885/files/pumotekeviririgisovilox.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gujogu.pdf
    • https://cdn.shopify.com/s/files/1/0427/7737/8972/files/nivop.pdf
    • https://cdn.shopify.com/s/files/1/0438/7795/7800/files/sukugovamalimimurow.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_off00007f2b.bin
eb6b46f4bf7bd6c8842ce35ef15b03b782c80c4d72d3f2b1b214e8095dd26222		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F2B 5692 bytes
font_01_sfnt_off0000925a.bin
0a0c447d0c334eebf7db7a3a415896d00da77ce45b152631d4aa76297690556e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x925A 10188 bytes

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