Malicious PDF — malware analysis report

Static analysis result for SHA-256 76e3b61fad329485…

MALICIOUS

PDF

45.4 KB Created: 2021-06-03 05:33:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: fc9bfab7291c519037b12ff76e7dfd9c SHA-1: a2fc7443c427f3a31ae5e4b627bb5a9777c8a6eb SHA-256: 76e3b61fad329485743fbd5ae5bd1548714a64b2e6f73c417212fdde1e92c7c9
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors and game hack lures, indicating a phishing or scam attempt. The primary link directs to 'https://netcdn.online/app/406889139/hack-coin-master-343-apk-game-hack', which is associated with malicious activity. The document body, though partially corrupted, contains text related to game hacks and a URL, reinforcing the lure. The presence of embedded URLs and the ML classifier's high confidence score support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/406889139/hack-coin-master-343-apk-game-hack In PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/does-roblox-premium-expire_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-robux-now_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/smart-lodhi-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-sexually-abused_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-minecraft-packs_GM479516143.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/oprewards-com-login_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-account-taker_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-generator_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-virtual-piano-hack_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-svg-free_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-hack-programers_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-free-cards-link-2021-today_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_off000052aa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52AA 25804 bytes
SHA-256: 92c62c081c1e11fb8d5a3cb37cc2d219336b5be9a19677a1cbeb288802bce928
font_01_sfnt_off00008f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F3A 18128 bytes
SHA-256: a2d04e112fb50d25b3678e27a44e3811fd107599395b3a06ad0331c443394bb7

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