Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d8c616998fb925a…

MALICIOUS

PDF

46.7 KB Created: 2021-06-10 23:28:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b82443adcdfd9915f90c75173618df6d SHA-1: d85ca1962c6ad626d3abc0b463025f4026aeeb3b SHA-256: 3d8c616998fb925a2cc2565ccecbc3cf5ee1cd3751ec142539cb21b744994043
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to a known malicious domain, masquerading as a game hack generator. The document body and heuristics indicate a lure designed to trick users into clicking these links, likely to download further malware or engage in phishing. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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-robux-hack-penguin-game-hack In PDF document text
    • http://digilib.stimata.ac.id/repository/how-to-gain-more-spins-on-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-roblox-banner-maker_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/give-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/http-bitly-coin-master-free-2021-spins_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/hacks-for-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/todays-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/how-to-get-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/fake-robux-codes_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/claim-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-links-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-hack-apk-july-29_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/reddit-roblox-hacked_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-link-spin_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-mod-apk-latest-hack-with-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/fighting-free-card-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-daily-free-spin-and-coin-link-haktuts_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/roblox-free-play_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-links-that-don-t-expire_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_off000051ac.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51AC 28468 bytes
SHA-256: d83517a771a38653c3f6ba72a51ceb958d03f66c1965e2619a96a1fe3d735790
font_01_sfnt_off00009223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9223 19048 bytes
SHA-256: da58c71f53b895db9107e3b887f9110fe799d9f33b780b0a7ea1efe2a36a96f2

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