Malicious PDF — malware analysis report

Static analysis result for SHA-256 552ecee88e2d9660…

MALICIOUS

PDF

34.8 KB Created: 2021-07-05 15:16:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f3d7878753fed911b34a811b7b35b30e SHA-1: a214fe565d09252255af1fd1437bb1c313c2e938 SHA-256: 552ecee88e2d9660da29a4b406c5943150cc63e01b8ea6ddbca0cee13779f60b
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to known malicious infrastructure, specifically promoting 'free generators' and 'game hacks'. The document body and heuristics indicate a lure for free Robux or game cheats, often a pretext for phishing or malware delivery. The presence of a call-to-action button and instructions for a password-protected archive further suggest a malicious workflow designed to bypass security controls.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/free-robux-just-enter-username-game-hack In PDF document text
    • http://lib.uho.ac.id/library/repository/blogspot-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-link-haktuts_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-free-robux-by-playing_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/como-ser-hacker-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-minecraft-account-and-password_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/www-roblox-play-for-free_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-in-app-purchases_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/is-minecraft-free-on-xbox_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/www-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-hacked-version_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/daily-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/offer-for-pubg-uc_GM1330123889.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-apk-android_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-generator_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/2021-roblox_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_off00003032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3032 22584 bytes
SHA-256: d0b161a4d45452c1c1d0e4893d775c23a943f9c27734136c356621ac419e07dd
font_01_sfnt_off0000629f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x629F 19244 bytes
SHA-256: bb42f0e36b7288fba8af59efb142b286361a630cbb1699ef387bab73f1413400

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