Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc518e973b31753d…

MALICIOUS

PDF

34.3 KB Created: 2021-07-05 16:31:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 59d72b50698c5ab8ac82f60ef639b317 SHA-1: ebaede1badbcc99a146b6a5a9c20c8c42fd861d4 SHA-256: fc518e973b31753d6c9741f4f84a8447876728e29aa36bdfdd410d9b3b62df9f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector, disguised as 'free generators' or 'game hacks' for popular games like Coin Master and Roblox. The primary lure is the URL http://netcdn.tw/app/406889139/coin-master-hack-spins-app-game-hack, which is flagged as malicious. The document's structure and embedded URLs suggest a phishing or scam attempt to redirect users to potentially harmful content or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-hack-spins-app-game-hack In PDF document text
    • http://cintabaca.org/katalog/repository/how-to-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-app-roblox_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/como-tener-mucho-dinero-en-jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-hacked-tshirt-id_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-get-free-dominus-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-free-play_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-get-free-robux-hack-5-minutes_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/hacks-for-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-hacks-for-mac_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/coin-master-free-online_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/minecraft-114-download_GM479516143.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/60-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-cheat-engine-check-cast-v3_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-get-free-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/check-background-net-roblox-hack_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-noclip-hack-jailbreak-outwit_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/coin-master-free-spins-and-coins-for-iphone_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/coin-master-hack-spins-ios_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_002_off00003018.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3018 22868 bytes
SHA-256: e40032b663ea3e02298114b8cbcc9f60278ab9a322628414a45102df00e4a0bf
font_01_sfnt_off00006387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6387 18180 bytes
SHA-256: 1e953b72540ec4677b5f3a09436cf02581c7252e246dbe5ac414cafa51ba2d5d

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