Malicious PDF — malware analysis report

Static analysis result for SHA-256 8427c6d6fa6d9cbf…

MALICIOUS

PDF

40.8 KB Created: 2020-06-25 22:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6ebacb77011462550d248a356b965d0 SHA-1: c4007ddf4039a6888d0b8a38203c8fc540b1acba SHA-256: 8427c6d6fa6d9cbfacc564e05737abf621f11dd46239f196d4375202cc098b16
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded URLs, many of which point to link farms hosted on disposable domains. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though obfuscated, contains references to truck buying guides and includes the malicious URL, suggesting a lure to trick users into visiting potentially harmful sites. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://ttraff.cc/wp3?keyword=truck+buying+guide+2014#truck+buying+guide+2014
    • http://luxeandplush.com/uploads/1/3/0/2/130291033/7698762.pdf
    • http://m4d-game.com/uploads/1/3/0/8/130874358/dikiken.pdf
    • http://daniellambert.net/uploads/1/3/0/6/130620585/3547345.pdf
    • http://leindl-design.com/uploads/1/3/0/5/130545932/ganexa.pdf
    • http://mauubezpieczenia.pl/uploads/1/3/0/8/130813032/341651c9d.pdf
    • http://jay-lassiter.com/uploads/1/3/0/4/130476062/pibigomavuvaju-joxamululeg.pdf
    • http://russianblackmailers.com/uploads/1/3/1/4/131406453/6366306.pdf
    • http://patrickx.net/uploads/1/3/0/5/130544625/5229188.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://kusoxakoj.files.wordpress.com/2020/06/kedevolunenenaz.pdf
    • https://bilivogeji390496675.files.wordpress.com/2020/06/netufifikuzakekajafuw.pdf
    • https://zitadoxoku.files.wordpress.com/2020/06/gapadufimimupab.pdf
    • https://goxafizazo.files.wordpress.com/2020/06/nesoxejimipavunitovavud.pdf
    • https://zapekijibu.files.wordpress.com/2020/06/bopafuges.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_off000063a8.bin
1996f1f35220442275dd88b147948f13f430459f8ae01f0a8e98ee6136401115		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63A8 5048 bytes
font_01_sfnt_off000074ec.bin
f40c3974991e67402eeb7a52b1bce703bdbbf9b220385f23ff49ec98ad5600b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74EC 10004 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.