Malicious PDF — malware analysis report

Static analysis result for SHA-256 351956ef83879045…

MALICIOUS

PDF

43.8 KB Created: 2021-06-09 17:06:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d27e464314955df0e96e2aa48059995e SHA-1: 85175f384971c45a3979a36a6fdf065902012544 SHA-256: 351956ef8387904569b909de1027efedcc5861712980504da75befabea60725e
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains lures for free game currency and cheats, impersonating brands like Facebook to trick users into clicking a malicious URL. The primary URL, https://netcdn.tw/app/835599320/free-tiktok-followers-and-likes-game-hack, is associated with a game hack redirect, indicating a phishing or malware distribution attempt. No scripts were extracted, but the document structure and embedded URLs suggest a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9816

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.tw/app/835599320/free-tiktok-followers-and-likes-game-hack.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.tw/app/835599320/free-tiktok-followers-and-likes-game-hack PDF link annotation
    • http://feuerwehr-rheinau.de/images/minecraft-complete-handbook_GM479516143.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/minecraft-menu_GM479516143.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/minecraft-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/how-to-get-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/free-printable-coloring-page-roblox_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/roblox-free-robux-hack-com_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/roblox-promo-codes-2021-robux_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/flame-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/coin-master-hack-2021-free_GM406889139.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/earn-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/free-attacks-on-coin-master_GM406889139.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/roblox-btools-hack-patched_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/blogger-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/roblox-hack-apk_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/coin-master-spin-cheat_GM406889139.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_off00004bff.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BFF 23016 bytes
SHA-256: 6af6c86c6b66723757a71631a736c25db55b2f3e8d231497f5070b9286bf1cd8
font_01_sfnt_off00007f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F55 2888 bytes
SHA-256: 2f5f0fc0bc2e44a39e81df338c202d2aa9228409b57f32fbedd5805dc83e19fa
font_02_sfnt_off00008946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8946 17868 bytes
SHA-256: 3d92bf9f97e5112d292b407947535e704fb05ee4c3221ca2b39c5e27e22079fe

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