Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c5233ea51ab531…

MALICIOUS

PDF

44.2 KB Created: 2021-06-03 11:56:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7e9d6570358e06e6c89434e1eecf43ba SHA-1: a61ec9dc18389780ab8cf61b703bb05a6d67d074 SHA-256: f1c5233ea51ab53107a59e948c73e776f01f014a9855731f0345df0b31922ff3
160 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a game hack redirector lure, pointing to malicious infrastructure. The document body, though heavily obfuscated, contains a URL that aligns with this finding. The presence of embedded URLs and the ML classifier's high confidence score further support the malicious nature of this document, likely intended to lead users to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/431946152/earn-robux-for-roblox-game-hack In PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-robux-picture_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-game-pack-with-google-play-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-hack-2021-iphone_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-spins-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-spins-and-coins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-roblox-exploits_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/giftrobux-com-generator_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/is-minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-hack-apk-download-2021_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/inappropriate-roblox-games-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/coin-master-map_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-coins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/best-site-for-free-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/how-to-get-free-robux-codes-2021_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
stream_004_off00005260.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5260 24740 bytes
SHA-256: 10f6ff4eef720f27258b9b513c134afdf0e8239e8adc459d0f3e924c2fb7da48
font_01_sfnt_off00008a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A20 18316 bytes
SHA-256: c0c60b14685fecf9466c28df4c763cf89eb547ddebc436478ad41afe4273dec9

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