Malicious PDF — malware analysis report

Static analysis result for SHA-256 2724bcddc1a39cf0…

MALICIOUS

PDF

47.2 KB Created: 2021-06-03 06:10:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 0841714326797e38f5ac61cfd3901cfb SHA-1: 92d2bd83fc44e432834db7b6a5c4562d34b5f765 SHA-256: 2724bcddc1a39cf09ff8d3da8744601bdbfedafead73fb3d9e9b99e2fe97851c
160 Risk Score

Malware Insights

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

The PDF contains multiple links that redirect to malicious infrastructure, specifically advertising game hacks and generators. The ML classifier also flagged this PDF as malicious. The presence of embedded URLs and a visual download button lure suggests an attempt to trick the user into navigating to a compromised site, likely to download a secondary payload or engage in further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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 https://netcdn.online/app/479516143/minecraft-free-download-linux-game-hack In PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/best-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/hacker-minecraft-song_GM479516143.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/roblox-promo-codes-2021-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/free-roblox-card_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-apk-hack-2021-ios_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/roblox-password-hacker_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/oprewards-com-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-free-spins-cash_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-offline-hack_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/how-to-get-free-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/freerubux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/free-avatar-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-free-coins--spins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/coinmaster-spin-ml-free_GM406889139.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
stream_004_off000054b0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54B0 31172 bytes
SHA-256: 3afa44f549b92d81f3f53e44a36ee2e94d38ab21074c76cc21a236edf3e9cbcd
font_01_sfnt_off000094ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94EC 18640 bytes
SHA-256: 2e09412aeccd6db579e17e260dc71f26a69ff1e6c71cb2a54a0bf8e01b9e41c1

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