Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa01bf6eba29066…

MALICIOUS

PDF

73.1 KB Created: 2020-12-28 17:50:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: bb58b7c597ec5a3b86963e8c8802affd SHA-1: 3e73dcd406eba48b39284476cca3f9ea6b6399ff SHA-256: 7aa01bf6eba29066d367c3ec60d1c2a33f9d0567746081685d6c5d60c9bf8226
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector link and a link farm. The embedded URLs, such as https://traffine.ru/aws?utm_term=xiaomi+mi+4k+android+tv+box+review and https://cdn.sqhk.co/pewovixosafu/hbAiiWV/simple_sandbox_2_mod_apk_unlock_all.pdf, are indicative of a phishing or scam attempt designed to redirect users to potentially harmful content. The presence of numerous PDF links further supports the attack pattern of a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffine.ru/aws?utm_term=xiaomi+mi+4k+android+tv+box+review In PDF document text
    • https://cdn.sqhk.co/pewovixosafu/hbAiiWV/simple_sandbox_2_mod_apk_unlock_all.pdfIn PDF document text
    • https://wodumipanopova.weebly.com/uploads/1/3/4/7/134731655/3624222.pdfIn PDF document text
    • https://cdn.sqhk.co/pupevadojas/SMy0t4g/torumofupurig.pdfIn PDF document text
    • https://cdn.sqhk.co/tifesiwafo/jhCJ7ib/lg_xboom_go_pl5_precio.pdfIn PDF document text
    • https://cdn.sqhk.co/vipabure/YvCgije/69715960345.pdfIn PDF document text
    • https://cdn.sqhk.co/boxokozofe/UoXG4kX/durelisenidefofaxifivo.pdfIn PDF document text
    • https://cdn.sqhk.co/jumifokujuje/4hfKjqo/nujakanolewoga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/gavubufuxatuwibomivitug.pdfIn PDF document text
    • https://s3.amazonaws.com/kimoweworape/c2o_coconut_water_barcode.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/overlord_character_sheet_maker.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/xifigidilinanupogabonaguj.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/utorrent_android_save_to_sd_card.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/pusesenotixapuvup.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_off0000e2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FC 5252 bytes
SHA-256: 8f9b61aff4b18d7643f20c567b257e0045af27d8e6e09bcd7287a4bd8126c58c
font_01_sfnt_off0000f4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DA 10068 bytes
SHA-256: 51afbd77e90fe01f39fea9e283a789ce8f2bfc71f5e6b4e1ab90088bfbd36f25

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