Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce1c0a4be9e16675…

MALICIOUS

PDF

34.4 KB Created: 2021-07-05 05:37:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 24e904a6f756a6c8f3b03e060f3218d2 SHA-1: 4eb43913487fbee2525889929d9655f4d5a423e5 SHA-256: ce1c0a4be9e166759ca681c1ffc0854165d85704cf88adda48a049c095208e3f
180 Risk Score

Malware Insights

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

The PDF contains a malformed stream and a critical heuristic firing indicates it links to a known malicious redirector infrastructure. The document body and embedded URLs promote a "free game pack" or "game hack" lure, which is a common social engineering tactic to trick users into visiting malicious sites. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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/free-game-pack-coin-master-game-hack In PDF document text
    • http://digilibfisip.unla.ac.id/repository/roblox-how-to-customize-your-character-for-free_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/rbx-roblox_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/minecraft-dungeons-free-download-pc_GM479516143.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/como-se-hacker-en-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/free-robux-no-human-verification-2021-no-download_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/giftrobux-com-generator_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/free-roblox-troll-outfits_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/veil-roblox-hack-paid_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/island-2-roblox-hack_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/how-to-hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/strawberry-roblox-cheat_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/how-to-use-roblox-cheat-engine_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/best-free-hack-for-roblox_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/free-robux-generator-2021-vrai_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/free-roblox-gift-card-codes-list_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/howto-hack-gear-in-the-roblox-catalog_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/hacking-roblox-with-code_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_off00002ecf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2ECF 23208 bytes
SHA-256: 164fa8eef235782077e9e2bca57b9c1922ccd63abfc0568f291fe28724f82cb1
font_01_sfnt_off00006343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6343 18584 bytes
SHA-256: 62bc779e0b99637fb65005790219b661c5e73bb3231c875a940f476a7c72bbc0

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