Malicious PDF — malware analysis report

Static analysis result for SHA-256 534ff2ed25ce657b…

MALICIOUS

PDF

67.6 KB Created: 2021-01-15 00:51:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 5b1ed7e4e2fee9da5e0e5fd8e909ed79 SHA-1: a4d2166cfdde311b6a8360f0cf90e0b8f5239fee SHA-256: 534ff2ed25ce657bdd81e12a96cef9283e95701892d276eba79382ff2cf3d1d4
182 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a redirector to malicious infrastructure. The heuristic firings indicate the document is designed to lead users to harmful sites, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's output strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9704

Heuristics 4

  • 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 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.
  • 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://ggtraff.ru/aws?utm_term=binomische+formeln+aufgaben+mit+l%25C3%25B6sungen+pdf In PDF document text
    • https://site-1175166.mozfiles.com/files/1175166/39394101636.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464078/normal_5fb6e85e7e322.pdfIn PDF document text
    • https://site-1166653.mozfiles.com/files/1166653/league_of_legends_wild_rift_uscita.pdfIn PDF document text
    • https://site-1178650.mozfiles.com/files/1178650/the_dark_book_rpg_offline_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382192/normal_5f9a7cf325fea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411701/normal_5fa38f17964d6.pdfIn PDF document text
    • https://site-1176551.mozfiles.com/files/1176551/reborabux.pdfIn PDF document text
    • https://cdn.sqhk.co/boxokozofe/2idmShe/metal_soldiers_2_mod_apk_home.pdfIn PDF document text
    • https://site-1166670.mozfiles.com/files/1166670/79460943116.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460461/normal_5fa12251658a0.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzaxube/ghljjhe/hd_video_downloader_browser_apkpure.pdfIn PDF document text
    • https://site-1176728.mozfiles.com/files/1176728/idle_coffee_corp_prestige.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91D 5896 bytes
SHA-256: a06a80232eae25a88f99c32f479db58d6df1646e43ce025addf6fadc9c684646
font_01_sfnt_off0000eccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCB 11244 bytes
SHA-256: da010a60fe3f2342c21d44695a71964a2efa76ff7ba9421855bf43d560bb250c

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