Malicious PDF — malware analysis report

Static analysis result for SHA-256 438ac79020b4916a…

MALICIOUS

PDF

34.8 KB Created: 2021-07-06 08:58:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 01857503c242b3744b2cec7655799475 SHA-1: c0f5e7186735409107141d38432a3d534ad9d08f SHA-256: 438ac79020b4916ae723b14f303ad6aa249942b93b2022d0087e9d67b94c6653
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as "free game hacks" for popular titles like Minecraft and Roblox. The ML classifier strongly flagged this PDF as malicious. The embedded URLs likely lead to further malicious content or phishing pages, aiming to trick users into downloading malware or divulging sensitive information.

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/479516143/is-minecraft-dungeons-free-game-hack In PDF document text
    • http://librarysenior.com/repository/minecraft-hacked-apk_GM479516143.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-event-hack_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/robux-robuxian-awesome-hack_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/how-to-download-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://librarysenior.com//repository/minecraft-pe-apk-download-free-015-0_GM479516143.pdfIn PDF document text
    • http://librarysenior.com//repository/free-robux-come_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/money-hack-roblox-retail-tycoon_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/how-to-make-a-private-server-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/hack-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/master-coin-hack-app_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/free-robux-meme_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/omo-recuperar-una-uenga-hacker-en-roblox_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/roblox-item-hack-2021_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/lazyblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/free-robux-com-2021_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
font_00_sfnt_off0000329c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x329C 22768 bytes
SHA-256: 89eaec7ddd23e5fb85ef5e4935b05c1513e06ac3f98b8dcf9bbbcc885ce9d810
font_01_sfnt_off00006568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6568 18304 bytes
SHA-256: ce690126d5ef6938f3c3401fec90eb29b657d34ca06495398573f2a883063706

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