Malicious PDF — malware analysis report

Static analysis result for SHA-256 78741497f4c50fb9…

MALICIOUS

PDF

66.3 KB Created: 2020-11-24 07:57:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 72fac8af4d68bd9bd29b22a97d982edb SHA-1: 6925efe647f4f66f09d630daca9aa07dd3a0d298 SHA-256: 78741497f4c50fb9ad6b2feb988921b483ba2b1c1629a808da5cf969ff16f4ba
222 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 'traffine.ru', and another for a PDF link farm. The ML classifier also strongly flagged this as malicious. While the document body is heavily obfuscated, the presence of these indicators suggests the file is designed to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wb?keyword=money%20chapter%20for%20class%205%20worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4446492/normal_5fb606b3350e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377407/normal_5f903b858c2ed.pdfIn PDF document text
    • https://litazivufili.weebly.com/uploads/1/3/4/3/134305244/8457270.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367645/normal_5f8846246f471.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403807/normal_5faa52afb83da.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/nezanurugega/fifa_16_apk_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/tazerojizigiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e6dd06b-9e68-4d6c-bb29-8f488c30a60f/1st_edition_player_s_handbook.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/kettle_moraine_scenic_drive_wisconsin.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/a_certain_magical_index_watch_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/amu_school_admission_form_for_class_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6aa5d8a-28d4-4aa3-bf0e-510d183b67e9/6027306307.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_off0000c445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC445 5492 bytes
SHA-256: da7340c2068e74668c6502c23346bfd01c46bae580c3ac54545389df07a05779
font_01_sfnt_off0000d71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71B 11272 bytes
SHA-256: a444dd7be2cf5f1a6899dd22914051c1623516bdcfe60a98bc56e572fca3b968

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