Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb70c51680537e49…

MALICIOUS

PDF

35.3 KB Created: 2021-07-06 12:34:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d825368a5545ebbf3206fb3dee0afa68 SHA-1: 8ea870c783faa788cdf869aa3fa2d7287b06eeec SHA-256: cb70c51680537e498d24aa87ac30cad8c23dab59c5bb64f63c7dc913cb75ab4c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to malicious infrastructure, specifically a site offering a 'coin master game hack'. The document body and heuristics indicate a lure for game-related cheats or hacks, which is a common social engineering tactic. The ML classifier also strongly flagged this PDF as malicious.

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-game-hack-apk-game-hack In PDF document text
    • http://library.thamrin.ac.id/repository/free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/script-for-cheat-engine-roblox_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/minecraft-app-free-download_GM479516143.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/roblox-group-rank-cheat_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/how-to-get-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/coin-master-free-stuff-links_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/free-coin-master-spins-links-2021_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/bloxland-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/gamesofficenet-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/free-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/how-to-hack-coin-master-in-pc_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/roblox-demon_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
stream_002_off00003419.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3419 22720 bytes
SHA-256: 4b33f2b7eeab8c0af57c14079e58dd875eb628a898c6c0a770be79f499067985
font_01_sfnt_off000066e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66E4 18440 bytes
SHA-256: 571ab4b458d0dac508f9535f575fba5b7e94d60ff2bdf8022b00b4ca59ab09de

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