Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab74378f5eb0cab…

MALICIOUS

PDF

40.7 KB Created: 2020-10-08 23:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d7a89c556825e8bf6dfc6285bf9918a1 SHA-1: e95fc6d29d6608de0b948872aae754d93220764a SHA-256: aab74378f5eb0cabab22cc8e268ff728e38fff0b5220318d390b292d02844585
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains the URL 'https://gettraff.ru/strik?keyword=minecraft+username+checker', suggesting a lure to a malicious site. The presence of multiple links to disposable hosting and the ML classifier's high confidence further support its malicious nature.

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://gettraff.ru/strik?keyword=minecraft+username+checker In PDF document text
    • http://files.riverwoodwinery.com/uploads/1/3/2/6/132682737/xefaz.pdfIn PDF document text
    • http://poxebur.livefreeub.net/uploads/1/3/0/9/130969198/wuxaroxuw.pdfIn PDF document text
    • http://files.kidwilliamrecords.com/uploads/1/3/0/8/130813586/xidosoduro.pdfIn PDF document text
    • http://timox.katiefrenchbooks.com/uploads/1/3/1/4/131437867/novoter-mafumaferile-jilenabod-toluzofovu.pdfIn PDF document text
    • https://site-1039517.mozfiles.com/files/1039517/bipizufogogakivewixuvob.pdfIn PDF document text
    • https://site-1039735.mozfiles.com/files/1039735/xeputiriraluji.pdfIn PDF document text
    • https://site-1039703.mozfiles.com/files/1039703/jojemolelonirikovu.pdfIn PDF document text
    • https://site-1039305.mozfiles.com/files/1039305/sepifunomen.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/1/0497/5280/1444/files/major_world_events_in_2012.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6229/5716/files/treat_and_train_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0467/8002/2937/files/fubuvibutisataxe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0344/7968/files/tapejerab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9897/1038/files/butaxuxavitabo.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6480 5160 bytes
SHA-256: 9f9bce771256b810bca38193e6781ca3816286b8a5b6440422bf77e8ce77df90
font_01_sfnt_off000075ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75EE 9468 bytes
SHA-256: e1005f242e3cffb229052154466c933fb64194ecdf6d101e73f48b32f56e99fc

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