Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38980bf7b0cbd3b…

MALICIOUS

PDF

69.8 KB Created: 2020-11-13 09:17:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 783dec5f85d190934ec04a83a2680809 SHA-1: dc27e83ac6a3612191add3c51e46bc8d1e9a26e7 SHA-256: b38980bf7b0cbd3bbcbff810a6917f909e42734fb17f6ce2fae8aca55e983668
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://traffmen.ru/strik?utm_term=bibliografia+de+libros+de+finanzas+c'. This URL is the primary indicator of malicious intent, likely serving as a lure for phishing or to download further malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/strik?utm_term=bibliografia+de+libros+de+finanzas+c
    • https://cdn-cms.f-static.net/uploads/4445892/normal_5fa4785662d5a.pdf
    • https://cdn-cms.f-static.net/uploads/4412902/normal_5f9d0382de3dd.pdf
    • https://cdn-cms.f-static.net/uploads/4392444/normal_5f91d3e50bc09.pdf
    • https://cdn-cms.f-static.net/uploads/4488322/normal_5fad7461c48a5.pdf
    • https://cdn-cms.f-static.net/uploads/4374540/normal_5f8d13aa5ceca.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2a9634c7-bd4b-445a-ae36-1a0788b6e5d2/13907342295.pdf
    • https://uploads.strikinglycdn.com/files/2c63593c-c679-4998-bacd-db1788a8edcc/48858625633.pdf
    • https://uploads.strikinglycdn.com/files/3bb2ffb3-458a-47e0-b712-50fd05493a5f/sarakededemow.pdf
    • https://uploads.strikinglycdn.com/files/406dcb44-308b-4a7c-bcf2-b52a6afda342/rixevoxufexefujijiletevon.pdf
    • https://s3.amazonaws.com/davolazupivowi/fun_coordinate_plane_worksheets.pdf
    • https://s3.amazonaws.com/saziwijaxodav/76933392677.pdf
    • https://s3.amazonaws.com/xalasawu/roblox_veteran_badge_picture.pdf
    • https://s3.amazonaws.com/vebogotexaf/nowij.pdf
    • https://s3.amazonaws.com/vobuturinivi/how_to_become_a_rainmaker.pdf
    • https://uploads.strikinglycdn.com/files/84e57bee-56d0-4905-832c-957bd09a454c/aplicacion_de_calor_y_frio_en_enferm.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_off0000cfde.bin
c8228922e952b4d7db19452a2d49d4ea400f8017b5aab0aa47cb739e4b9e509d
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDE 5428 bytes
font_01_sfnt_off0000e271.bin
fdd0869720e4460a9b7bc1dd8d304e4e256f2c68dcb66a1d9df63c624ba5c224
pdf-font-stream PDF embedded font (sfnt) at offset 0xE271 11620 bytes