Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb37b97c1632234…

MALICIOUS

PDF

34.8 KB Created: 2021-07-04 14:08:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: dd392d0b13f7d3be34b6a635266c18b2 SHA-1: 73426ab79f9df1942d01e7e13eb681a2b729436d SHA-256: 8fb37b97c16322345af22910390dd61dd1deb58fe718bad8cb442d65182576db
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirectors and other malicious PDFs, masquerading as game hacks and generators. The primary redirector URL is http://netcdn.tw/app/479516143/minecraft-dungeons-free-download-game-hack, which likely serves as a lure to download further malicious content. The ML classifier strongly indicates malicious intent.

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/minecraft-dungeons-free-download-game-hack In PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-apocalypse-rising-hacks-2021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-bobux_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-hack-injector_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/best-free-clothing-for-roblox-war-group_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-memes_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-make-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/minecraft-app-store-free_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-free-coins-twitter_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/ilenders-roblox-youtube-hacker_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-hack-without-verification-for-iphone_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-free-stuff-on-roblox-android_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-use-patcheds-hacks-for-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-hack-levels-dragon-ball-z-revalations-roblox_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_off0000326c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x326C 22276 bytes
SHA-256: 2ea50215d5a6346433cda70afef293ace0b7b9b681f0be5c1f4422ee17be12b9
font_01_sfnt_off00006413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6413 18720 bytes
SHA-256: 9131f8ae0af3742f2152d673706180936bbe7c3ea282a1fb4d0c655f83237649