Malicious PDF — malware analysis report

Static analysis result for SHA-256 989406be061e6fa6…

MALICIOUS

PDF

34.1 KB Created: 2021-07-09 01:31:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ef9b934e90790a22d6ab8fbfc8c01b35 SHA-1: 25985e687edd709be84a14f4e3b67dbaae8252df SHA-256: 989406be061e6fa64e1d6a3a365e9a065fbbaac5911ebbc9e00667d36cd61926
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical lure related to game hacks, directing users to a known malicious redirector. This redirector then serves further PDF documents, indicating a multi-stage lure designed to trick users into downloading potentially malicious content. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • 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.
  • 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
  • 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 http://netcdn.tw/app/406889139/coin-master-spin-rewards-game-hack In PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/robux-page_GM431946152.pdfIn PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/free-minecraft-servers-to-join_GM479516143.pdfIn PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/tiktok-follower-bot-free_GM835599320.pdfIn PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/minecraft-pocket-edition-mods-for-free_GM479516143.pdfIn PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/robux-free-robux_GM431946152.pdfIn PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/roblox-hack-skript-ve_GM431946152.pdfIn PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/coin-master-gold-cards-hack-2021_GM406889139.pdfIn PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/redeem-roblox-card-free_GM431946152.pdfIn PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/free-robux-download_GM431946152.pdfIn PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/free-gifts-coin-master_GM406889139.pdfIn PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/how-can-someone-hack-roblox-account-frim-discord_GM431946152.pdfIn PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/coin-master-ios-gods-hack_GM406889139.pdfIn PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FD9 22528 bytes
SHA-256: 385809231747347575b2a8921c7f938afcf6781d7b771aa24a417b01d270aec3
font_01_sfnt_off0000623b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x623B 18348 bytes
SHA-256: b6a1bdd00d84950d59c3a90ff303f538fed799227134c5a7e1ea06d428d69b7b

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