Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f88b3c87ed8915…

MALICIOUS

PDF

34.4 KB Created: 2021-06-26 03:27:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 84fa615d7ee0d1019d088f5e8500639c SHA-1: 2fa654b8f54524fc5d200b36d12012725148a4fb SHA-256: 21f88b3c87ed8915fdf360bf38ee22dc55d9c197d30b456ba7a2cc9380556f5b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that are identified as malicious redirectors, specifically luring users with promises of game hacks and generators. The document body and heuristics confirm the presence of these malicious links, which are designed to lead users to potentially harmful content or further malware downloads. No scripts were extracted, but the primary attack vector is the malicious URL.

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.co/app/431946152/roblox-mod-download-free-game-hack In PDF document text
    • http://lib.smklabor.sch.id/repository/best-way-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/gget-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-roblox-noob-accounts_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/comment-cheater-sur-roblox-relail-ticoon_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-free-robux-september-2021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/cheat-roblox-superpower-training-simulator-2021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-apk-hack-2021_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-accounts-2021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-cheat-engine-jailbreak-2021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/get-free-robux-no-hacks-and-no-buiders-club_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-unlimited-spin-link_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/minecraft-free-apk-download-016-0_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/when-will-bloxburg-be-free-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-free-roblox-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-roblox-money-no-verification_GM431946152.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_off00002f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F71 22048 bytes
SHA-256: 2273f985a1481ca9bda5077ca112d9a7df3f99b7c3a9f8957dad8188829547c8
font_01_sfnt_off00006044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6044 19352 bytes
SHA-256: ebe27131f681a2b6ee5250ddbb62214400f30873dd005317b296b33391da2cfe

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