Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc41a27e885f7177…

MALICIOUS

PDF

34.9 KB Created: 2021-07-05 23:11:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 2cef95997a98499406c33afd83a171bf SHA-1: fe5dfc603257681285ed5508403e7b8a6b139274 SHA-256: bc41a27e885f717720b55583a5ea6199d47451223eee901a11120688be387c8a
160 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to known malicious redirector infrastructure, specifically advertising a 'game hack'. The primary lure URL is http://netcdn.tw/app/406889139/regal-world-coin-master-game-hack. The ML classifier also strongly indicated maliciousness. The document's purpose appears to be tricking users into visiting these malicious sites.

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/406889139/regal-world-coin-master-game-hack In PDF document text
    • http://digilib-ppsunisma.ac.id/repository/cheat-codes-for-dungeon-quest-roblox_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/roblox-hack-ga_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/robuxhackjs_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/free-robux-pastebin-hack_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/hacks-para-volar-en-roblox-2021_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/appsmob-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/how-do-you-hack-your-friend-on-roblox_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/earn-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/free-trial-builders-club-on-roblox_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/earn-rixty-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/free-robux-hack-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/free-roblox-account-generator-2021_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/youtube-you-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/pastebin-roblox-hack-script_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/quickest-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/how-to-spawn-in-working-gears-roblox-hack-script_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/free-robux-hack-generator-app_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/robux-hack-created-by-robuxian_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/focus-points-hack-roblox-dance-your-blox-off_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_off0000318b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x318B 23108 bytes
SHA-256: 0d8ec45f67cba8546197a06ff1065bcae09a2cabda4f1d308274e40f9444cd50
font_01_sfnt_off00006571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6571 18280 bytes
SHA-256: 5aed029aeaebf97b3b18bb1c617ca2ab564e35296fc4693c3058f9041375acb1