Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad10b87a3b37f2dc…

MALICIOUS

PDF

46.0 KB Created: 2021-06-11 04:22:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1057dbe9f23dc9b57ac109fee69f3aac SHA-1: e19b75f7950db5c56247bef7cc8f5c23b7e5ea50 SHA-256: ad10b87a3b37f2dc00103bc969629fe826060909647ecae1eecee893a96f3c4b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to known malicious redirectors, specifically advertising a 'game hack' for Roblox. The document body, though heavily obfuscated, contains references to the same malicious URL. This indicates the primary purpose is to lure users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.tw/app/431946152/roblox-free-shirts-and-pants-girl-game-hack In PDF document text
    • http://lib.smklabor.sch.id/repository/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/give-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-cartoony-animation-for-free-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/pubg-uc-buy-paytm_GM1330123889.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-mod_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-daily-spin-link-app_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-attack-block-hack_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-free-coins-generator_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-tycoon-hack-scripts_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/are-robux-generators-safe_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-free-robux-ez-ways_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-gold-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-avatar-girl_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/whats-robux_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-32-hack-apk_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-scams_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/robux-codes-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-coin-master-spins-hack_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
stream_004_off00005124.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5124 27548 bytes
SHA-256: 36908cbfc515da50b03fc46b68053e931f5c72e4c01a9de1cf700a61fa56d029
font_01_sfnt_off00008fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FA9 18892 bytes
SHA-256: 32d1d5c766729d95f202c9b45f86c1041550d9b2096c4b52f31d4a6d9945704e

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