Malicious PDF — malware analysis report

Static analysis result for SHA-256 af32048d0abed0d0…

MALICIOUS

PDF

46.7 KB Created: 2020-10-07 17:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f1e977491fba0ccd9f787575d2964d63 SHA-1: 0e356bd2724c281dd8039cefc1b1dc66e714605e SHA-256: af32048d0abed0d0a205b592c5401468a2449de0192e3941e3ed589187edb452
124 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://cctraff.ru/strik?keyword=free+wii+points+codes+generator', is flagged as a malicious redirector. The document body also contains this URL and references 'Free wii points codes generator', indicating a lure to a potentially malicious site. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/strik?keyword=free+wii+points+codes+generator In PDF document text
    • http://files.countryminds.com/uploads/1/3/1/4/131455543/5274543.pdfIn PDF document text
    • https://site-1038556.mozfiles.com/files/1038556/76994286788.pdfIn PDF document text
    • https://site-1039161.mozfiles.com/files/1039161/fokugexenoxuwejab.pdfIn PDF document text
    • https://site-1036973.mozfiles.com/files/1036973/dopenivenoxije.pdfIn PDF document text
    • https://site-1041485.mozfiles.com/files/1041485/wedifapeze.pdfIn PDF document text
    • https://site-1039307.mozfiles.com/files/1039307/xoxasubowifuwe.pdfIn PDF document text
    • https://site-1037833.mozfiles.com/files/1037833/zadejapulosamowo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/6074/3329/files/xojozuvemebudedij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9167/6321/files/1057106657.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5427/6001/files/ramorijaraperasizojuf.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6219 5256 bytes
SHA-256: cc8d71b51b4d76fb4029086f0437d218d929704f534cea8cd0bd0057722ae78c
font_01_sfnt_off0000741f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x741F 10908 bytes
SHA-256: 9a2140075712eba5c4e623465a9c66b2128d6ca7a5af04130e3f10fc1648801e
font_02_sfnt_off00009909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9909 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2

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