Malicious PDF — malware analysis report

Static analysis result for SHA-256 01a39cd389bc6e96…

MALICIOUS

PDF

41.9 KB Created: 2020-07-10 20:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6a85a49df5a755f3acec8db27f61ae7 SHA-1: 2bd728ff22d0fe193ff86122304e916cc5cd8335 SHA-256: 01a39cd389bc6e96b46b3104bdd5a746cd638b942ed4f5140f276394b3ba5bf1
214 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious Link

The PDF contains a large number of embedded links, a common tactic for SEO link farms. One of these links, 'https://ttraff.com/wb?keyword=continents%20and%20oceans%20worksheet%20quiz', is identified as a malicious redirector. The ClamAV detection and ML classifier further support the malicious nature of this PDF, classifying it as a dropper.

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.
  • ClamAV: Pdf.Dropper.Agent-8953214-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8953214-0
  • 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.com/wb?keyword=continents%20and%20oceans%20worksheet%20quiz
    • http://files.fullflightcounseling.com/uploads/1/3/0/7/130775195/4308137.pdf
    • http://files.ewalkthrough.org/uploads/1/3/1/3/131398177/jogikabaxeja.pdf
    • http://files.christiananker.com/uploads/1/3/1/3/131382141/c3637.pdf
    • http://files.fhstrackandcross.org/uploads/1/3/1/0/131070911/110e8.pdf
    • http://files.animalwonders.org/uploads/1/3/2/8/132814067/1328505.pdf
    • http://files.simonfurdal.com/uploads/1/3/0/8/130813546/d98bb7ae64ff52b.pdf
    • http://files.paperboyproductions.net/uploads/1/3/1/4/131455463/6567438.pdf
    • http://files.sachdevwc.com/uploads/1/3/1/8/131857152/radawugupesine.pdf
    • http://files.sueannecelebrant.com/uploads/1/3/1/4/131437351/26ff42c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://xividitusaje.files.wordpress.com/2020/07/wiketumubudobojoj.pdf
    • https://vezobufo703077091.files.wordpress.com/2020/07/4155481837.pdf
    • https://radizananuf.files.wordpress.com/2020/06/zorowuluvuniwuw.pdf
    • https://bobunob.files.wordpress.com/2020/06/81537042422.pdf
    • https://daxetojip161513793.files.wordpress.com/2020/06/zokin.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/geligup.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/metegemekipezafekude.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/malerofefamizekigo.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_off00005fbe.bin
e1329ae28a745eb29168ff5a038b35cbe025b0ae46d2f76952dd8795b2d51c9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FBE 5232 bytes
font_01_sfnt_off0000719c.bin
84fd7b5add80525bdaf20817730c71dded85e54ac091f292a5f911ee3215ca19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x719C 12960 bytes

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