Malicious PDF — malware analysis report

Static analysis result for SHA-256 748ac9cd8d048a0b…

MALICIOUS

PDF

40.8 KB Created: 2020-09-28 20:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d1c12b6551bb553c773cb2268fafccd SHA-1: 9dbf56072500961a9c9960c012df43fc5eb11777 SHA-256: 748ac9cd8d048a0b30c201e4fb3501ba448c570b51b78fe8cc2a8b2db6f09a83
124 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, many of which point to disposable hosting domains and a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://cctraff.ru/mozel?keyword=cash+book+meaning+pdf', indicating a lure to a malicious site. The presence of multiple links and the ML classifier's high confidence score suggest this is a deliberate attempt to redirect users to malicious 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/mozel?keyword=cash+book+meaning+pdf
    • https://site-1036957.mozfiles.com/files/1036957/10360370416.pdf
    • https://site-1036636.mozfiles.com/files/1036636/zupibavaxokijavelori.pdf
    • https://site-1037204.mozfiles.com/files/1037204/29170576591.pdf
    • https://site-1036921.mozfiles.com/files/1036921/tuvitimagewug.pdf
    • https://site-1036678.mozfiles.com/files/1036678/xoxufefuzimipiripifo.pdf
    • http://files.iahuh.net/uploads/1/3/2/7/132741189/8680233.pdf
    • http://files.chateaumae.com/uploads/1/3/2/8/132814990/zimuvedofiba.pdf
    • http://files.mpcharmnails.com/uploads/1/3/1/0/131070173/nadasukofinudu_sulefozisigula.pdf
    • http://betufus.pmhsdavis.com/uploads/1/3/2/6/132681268/bemupujo-jafasebovofe-wajirefiriride.pdf
    • http://files.topproductcomparisons.com/uploads/1/3/1/8/131856225/xolidov-gamejo.pdf
    • http://files.mckaychurchsupply.com/uploads/1/3/1/4/131438477/zovevup-jozajidakokulub.pdf
    • http://files.martinprice.ca/uploads/1/3/2/6/132696194/1375248.pdf
    • http://mekutijuk.elenash.com/uploads/1/3/2/7/132712615/malup-ruraruselez.pdf
    • https://site-1037212.mozfiles.com/files/1037212/nowizivesikibidileginifed.pdf
    • https://site-1036997.mozfiles.com/files/1036997/jikopemevov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off00006104.bin
a079a030e527c431744a0be250e24c58426b5545378752259c30654b2bd01e79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6104 5436 bytes
font_01_sfnt_off0000735b.bin
3918e1d7b538b9571fbb872050a06914fee90c692fc6711eea279e9ca65e652a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x735B 10324 bytes

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