Malicious PDF — malware analysis report

Static analysis result for SHA-256 31bbc34c92858fb7…

MALICIOUS

PDF

34.6 KB Created: 2021-07-05 16:05:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 504aee5f078ed57bbc390c5500b0eb0f SHA-1: b92ffa8a15653d4997a3dc08de51ff084bd47160 SHA-256: 31bbc34c92858fb7f5795eb7e1633d21498bffb423e9ebd0ef458f8b6d66e1a0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a malicious redirector, designed to lure users with promises of free game currency or hacks. The primary lure is 'how-do-you-get-roebucks-for-free-game-hack' hosted on netcdn.tw, which is known malicious infrastructure. The document body and embedded links suggest a social engineering tactic to trick users into visiting potentially harmful websites.

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/431946152/how-do-you-get-roebucks-for-free-game-hack In PDF document text
    • http://cintabaca.org/katalog/repository/free-robux-real-working_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/guess-that-song-roblox-cheat-sheet_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-hack-in-roblox-soul-stone-sim_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/bot-groups-free-roblox_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-robux-hack-download-2021_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/comment-gagner-400-robux-sans-hack_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/minecraft-ore-finder-mod_GM479516143.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/hack-robux-infinitos-en-roblox-pastebin_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-robux-thru-discord_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/free-game-pack-coin-master_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/robux-boost_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/freetaco-roblox_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/tryrbx-site-free-robux_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-gun-free_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/hack-de-allah-akabar-roblox_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/robux-for-kids_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/minecraft-building-hacks_GM479516143.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_off0000300d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x300D 22320 bytes
SHA-256: b70fe975720d9fdae29dfd187bcbe0a26e853ebafa5d68d29e18535885f32f90
font_01_sfnt_off00006161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6161 19276 bytes
SHA-256: 041621602f91f6b02ab17a8512f032c3ef5c76435d73db42d8fa43aa781a2561

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