Malicious PDF — malware analysis report

Static analysis result for SHA-256 44afa83b22154d69…

MALICIOUS

PDF

34.0 KB Created: 2021-07-05 10:53:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: f1109b3ff395471b0feba1fce8ddb9e9 SHA-1: 4731b33a895fc430266ab4938d4ef2bb66a9c5d7 SHA-256: 44afa83b22154d699e32a069d9da4755f8f7fcf86d4f9a72c776f9d52deeca61
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generators' and 'hacks' for popular games like Coin Master and Roblox. The presence of a download button lure and the ML classifier's high confidence score indicate a malicious intent to trick users into visiting potentially harmful sites. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

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-gold-cards-free-link-game-hack In PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/robux-free-co_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/roblox-password-hacker-no-download_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/five-roblox-games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/how-to-get-free-robux-for-games_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/sex-hack-roblox_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/coin-master-bonus_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/minecraft-hacker-skin_GM479516143.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/roblox-arsenal-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/piano-player-hack-for-roblox_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/free-coins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/coin-master-free-cards-2021_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/free-robux-just-click_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/robux-hack-2021-phone_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/can-u-hack-roblox_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/free-robux-no-anti-bot-verification_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_off00002f1c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F1C 22652 bytes
SHA-256: 3120b40ddb1775d8cee6dd797074bbfe32985d38cac6169690ecf0926d732c5f
font_01_sfnt_off000061de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61DE 18416 bytes
SHA-256: f5d74da11fc7768080f5307fe29cc26711bb20e71de5af0a17c090bfb21e796a

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