Malicious PDF — malware analysis report

Static analysis result for SHA-256 3381507e159166c8…

MALICIOUS

PDF

34.3 KB Created: 2021-06-30 22:49:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ffa55944044eac9fc9a075c469d7d15d SHA-1: 9ba9e8c7a1852d2cf8bb4a95dc3721f972ad560d SHA-256: 3381507e159166c8f09cf1b63f41138da58305e3d046b0c6851081e5b1a211fe
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector infrastructure at http://netcdn.co/app/431946152/cool-roblox-skins-for-free-game-hack. The document body and extracted URLs suggest a lure related to free game items and hacks, likely intended to lead the user to a malicious download or exploit. The ML classifier also strongly indicated maliciousness.

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.co/app/431946152/cool-roblox-skins-for-free-game-hack In PDF document text
    • http://lib.smklabor.sch.id/repository/free-girl-faces-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-change-your-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/wurst-18-9_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-spins-coin-master-links-thursday-november-28-2021_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/deadly-sins-online-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-free-cards-sets-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/speed-run-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/sword-burst-2-cheats-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-money-on-roblox-a-hack_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-give-free-robux-to-friends_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-no-human-verification-or-password_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/como-hackear-coin-master-sin-verificacion-humana_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-admin-hack_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-free-robux-legit-2021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-free-robux-script_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-make-robux-free-no-hack_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-free-robux-on-roblox-ctrl-s_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-free-robux-no-jailbreak_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-roblox-redeem-pins_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_off00002f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F9F 22376 bytes
SHA-256: c72c3e1c7bbb4a960fccb185d36449947620c8d53efb6960416a46668384a55f
font_01_sfnt_off00006149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6149 18940 bytes
SHA-256: 61d42480b58b4486f6961b466964207cab720ba87ffbc2af26a7d8609710934c