Malicious PDF — malware analysis report

Static analysis result for SHA-256 c90fc45b113ba9e7…

MALICIOUS

PDF

33.9 KB Created: 2021-07-05 00:25:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: dd5358ceeda432445a9a8e0c85e3dcbd SHA-1: bef143cda2ea40eb2f49bce5ef010185425fc881 SHA-256: c90fc45b113ba9e749bcac937772c4a72cc4cbcfb09605b03969d7498beb9245
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and lures users with promises of free game items like 'free Minecraft Capes' and 'free Robux'. The document body and heuristics indicate a redirection workflow designed to lead users to potentially malicious websites. No scripts were extracted, but the overall pattern suggests a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/free-minecraft-capes-game-hack In PDF document text
    • http://lib.teknik.unimal.ac.id/repository/how-to-get-free-robux-2021-without-builders-club_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/www-free-robux-com_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/minecraft-free-download-android-apk_GM479516143.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/roblox-free-robux-hack-download_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/alone-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/como-hackear-coin-master-en-espaol_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/probloxicu-robux-free_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/dayz-3-beta-roblox-cheats-codes_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/free-coin-master-spins-2021-link_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/speed-hack-using-check-cashed-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/roblox-how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/free-roblox-groups_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/aimbot-hack-download-roblox_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/minecraft-windows-10-hacked-client_GM479516143.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/free-unlimited-robux-generator_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/roblox-games-to-play-for-free-online_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_off0000324b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x324B 22056 bytes
SHA-256: 1d97ccdfa4bb1d183cd86b94e127e5fcacec9531733b025b0aa6b3c53c3cd5ab
font_01_sfnt_off00006297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6297 18032 bytes
SHA-256: 1e862981e003b551836a585810ec825e70eaac9e05fbd38dc5ef0e36a4934143

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