Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dacf7cd2afcdd1b…

MALICIOUS

PDF

48.0 KB Created: 2020-08-01 23:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60853c37d02111393fd21891f978172d SHA-1: cf0cf2125d82a2855bc5ddacc18ae8ed1c952bd0 SHA-256: 5dacf7cd2afcdd1bd661797c2322d439fde1953e607ca1c9118fe134deb56ce1
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a link farm pointing to potentially malicious redirector infrastructure. The primary malicious URL, 'https://ttraff.ru/pify?keyword=php+replace+special+characters', is flagged as a redirector. While no scripts were explicitly extracted, the PDF structure and the presence of embedded URLs suggest an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

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=php+replace+special+characters
    • http://files.highpeaksadventureco.com/uploads/1/3/2/7/132740352/5d115159.pdf
    • http://files.masoncitychristian.com/uploads/1/3/1/4/131454024/5377651.pdf
    • http://files.pacificcoastpsych.com/uploads/1/3/0/7/130776031/b3516b70de4.pdf
    • http://files.breatheserenity.com/uploads/1/3/1/3/131383575/xupiwar-jowejisu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8236/6629/files/27977148493.pdf
    • https://cdn.shopify.com/s/files/1/0431/4087/4408/files/44764902530.pdf
    • https://cdn.shopify.com/s/files/1/0432/4176/7072/files/varufuzulusubutuza.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/5503674165.pdf
    • https://cdn.shopify.com/s/files/1/0438/2454/5949/files/zidasewugomosovipatalule.pdf
    • https://cdn.shopify.com/s/files/1/0441/2948/4952/files/9126081014.pdf
    • https://cdn.shopify.com/s/files/1/0434/5787/2039/files/17601174612.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70278744099.pdf
    • https://cdn.shopify.com/s/files/1/0428/3547/6636/files/three_story_pagoda_memo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6533/5190/files/77659186631.pdf
    • https://cdn.shopify.com/s/files/1/0434/7078/2624/files/romance_of_the_condor_heroes.pdf
    • https://cdn.shopify.com/s/files/1/0431/0594/3701/files/62328815929.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_off00005f90.bin
6cb96234239a71aef21b070a3030c6c9d5faca7d7c501032137dd738e383cac5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F90 5020 bytes
font_01_sfnt_off0000709a.bin
98f4fd3bac23fa73baf03373802fb4c554e5d63b483bcf7a91a352c79ac5a56b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x709A 25448 bytes

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