Malicious PDF — malware analysis report

Static analysis result for SHA-256 236d7c7e79c0fbb8…

MALICIOUS

PDF

50.5 KB Created: 2021-06-03 07:57:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 78d474ee12de890fd2cc8f72d88506c0 SHA-1: a843486775322aa4469474792035f885ac0e0f4d SHA-256: 236d7c7e79c0fbb889ed23b03df8543d7094faab231079b647f64147902e1b51
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, specifically advertising game hacks and free accounts. The ML classifier also flagged this PDF as malicious. The presence of a download button lure further supports the malicious intent of directing users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9779

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/431946152/roblox-rape-hack-game-hack In PDF document text
    • http://library.umla.ac.id/repository/how-to-hack-coin-master-spin-ios_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-roblox-account-generator_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/how-to-get-free-spins-on-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-top_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/minecraft-pe-free-ios_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/como-hackear-coin-master-2021-espaol_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/hack-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-minecraft-wallpaper_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-hack-game_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-free-accessories_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-free-redeem-code_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-spin-card-exchange-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-35-13-hack-download_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/www-coinmaster-com_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/spin-coin-master-free_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/pubg-uc-kart_GM1330123889.pdfIn PDF document text
    • http://library.umla.ac.id//repository/roblox-jailbreak-hack-download_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051aa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51AA 30244 bytes
SHA-256: e59c96b479c10c0132fcdf1c83c8066e2da13a42ba32cdfbcba2d5920cdbc0b5
font_01_sfnt_off00009803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9803 2984 bytes
SHA-256: a48876ea4c8ebf6e5aafed7b7988c43bbdc4f269aae7d16f65c21390373c25ca
font_02_sfnt_off0000a251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA251 18356 bytes
SHA-256: 8a1fe0c7231104fca4fa627868bae52978e90e92fc8d209bfe3611444447d27b

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