Malicious PDF — malware analysis report

Static analysis result for SHA-256 2735b7aec47a7ac6…

MALICIOUS

PDF

52.0 KB Created: 2021-06-09 09:45:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: fe61b46ebbaaecb102f4da1739fed087 SHA-1: 42a5a823e7a649061b84742edd574c5027cf9330 SHA-256: 2735b7aec47a7ac69f710fede389cdfbf110d6269f2d999c80c033bccb8e0450
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising 'game hacks' and 'free generators' to lure victims. The primary malicious URL identified is https://netcdn.tw/app/431946152/roblox-cheat-engine-speed-hack-2021-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or social engineering attack aimed at driving traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9464

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.tw/app/431946152/roblox-cheat-engine-speed-hack-2021-game-hack In PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-spin-online-tool-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/blox-fun-info_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-spins-link-whatsapp-group_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/ear-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-roblox-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/roblox-robux-generator-tool_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-code-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-from-roblox-games_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-hack-without-human-verification-india_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/make-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/worst-roblox-avatars_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-spins_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-hack-in-arsenal_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/hack-coin-master-download_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-cards_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-hack-android_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005050.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5050 30180 bytes
SHA-256: 1ca84d01d7a2cbc83490e3841bd9c91f42d5f34c0262b788f9a756193bbce13b
font_01_sfnt_off00009798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9798 4044 bytes
SHA-256: 5196410bcdfc72ecb4ad7d922073bb6d34bf55d37084e4ffe688bf66f2d13d53
font_02_sfnt_off0000a4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA4C1 19612 bytes
SHA-256: 311cf0c30fe976afeae734b8e64501734853b50641846189f13de626ea314c09

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