Malicious PDF — malware analysis report

Static analysis result for SHA-256 42599d460d8cb910…

MALICIOUS

PDF

45.9 KB Created: 2021-06-03 22:03:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: def65c085f0f6586da31bcd8c36f3958 SHA-1: 1ba4008260b6a4a27c7ca36915ecd0cb5d4333a5 SHA-256: 42599d460d8cb91045a6457376c270a79bfd64acbc4147fb165c86b7c9e15891
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one identified as a malicious redirector, leading to a lure for free game hacks. The document body and embedded links suggest a social engineering tactic to trick users into visiting potentially harmful websites. While no scripts were explicitly extracted, the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of malicious intent.

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.online/app/479516143/free-online-minecraft-server-game-hack In PDF document text
    • http://www.library.smactf.sch.id/repository/roblox-people-girl_GM431946152.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/free-coin-master-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/roblox-avatar-girl_GM431946152.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/roblox-redeem-robux_GM431946152.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/roblox-points_GM431946152.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/coin-master-unlimited-spin-link_GM406889139.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/coin-master-hack-tool-v1-9-apk_GM406889139.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/coin-master-game-2021-free-spin-link_GM406889139.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/how-do-you-earn-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/coin-master-cheats_GM406889139.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/coin-master-hack-extension_GM406889139.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/minecraft-world-free-download_GM479516143.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/free-flip-master-coins_GM406889139.pdfIn PDF document text
    • https://www.youtIn 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_off00004ffd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FFD 29492 bytes
SHA-256: 64e87822e0fba44b8b4e55634a41ab5bba13ff44490645cd7c7c67accfafcb1a
font_01_sfnt_off00009298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9298 17756 bytes
SHA-256: 14377ac3d18db81ff7447bb693ccee55c7f80471e2aeaf98ca779f1b2357c71e

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