Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f98c943a73fd16a…

MALICIOUS

PDF

33.5 KB Created: 2021-07-06 03:23:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c4ab0ed607e9327af8183dec97c08a5b SHA-1: 7a2bd7d372ee78502157c7e593ba0af15703f8e4 SHA-256: 3f98c943a73fd16a634a5bd23fa1cddf085c06726173115fdcc9eafeced05eaa
160 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a game hack redirector lure, pointing to malicious infrastructure. The document body and embedded URLs reinforce this, indicating a social engineering attempt to trick users into visiting a malicious site. The ML classifier also flagged this PDF with high confidence.

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/479516143/toolbox-for-minecraft-pe-game-hack In PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-hack-gui-download_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-free-complete-game_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-spins-generator-no-verification_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/cerberus-hacking-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-admin-free-spins_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-hack-tool-v1-9-download-free_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-game-free-play-online_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/pokemon-go-free-accounts-level-40_GM1094591345.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/2-free-pants-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/download-hacked-fersion-of-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-script_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-hack-any-roblox-account_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_off00002e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E6B 22120 bytes
SHA-256: c9f6553e73fb636c44e2a548d67c534e599d97833f3785299ce443803a424807
font_01_sfnt_off00005f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F2D 18592 bytes
SHA-256: f32c1ca8168d27304aec22942809e8223fb1c64027b7ede4107c71745ae71c26

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