Malicious PDF — malware analysis report

Static analysis result for SHA-256 f683564bce41ee55…

MALICIOUS

PDF

44.5 KB Created: 2021-06-03 05:59:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: a6167ef4d4b2b502d261ff79f84f45c9 SHA-1: 068e512402df7d3e4ea448480040378b6ebc544a SHA-256: f683564bce41ee55e3be9d62b55c6181b3e8b98c4b6409d18ab7bf4a00820316
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to known malicious infrastructure, specifically advertising game hacks and generators. The heuristic firings confirm these links point to malicious redirectors and a lure for game hacks. While no scripts were extracted, the embedded links are the primary attack vector, likely leading 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/406889139/coin-master-apk-hack-2021-ios-game-hack In PDF document text
    • http://library.acehresearch.org/repository/how-to-get-minecraft-realms-for-free_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-pc-hack_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/robux-scam_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/minecraft-free-unblocked_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/minecraft-xray-hack_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-cheat-codes_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-free-vip-server_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-codes_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/minecraft-hack-ios_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/optifine-pe_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-get-free-pets-in-adopt-me-roblox_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/minecraft-free-no-download_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-hack-without-verification-ios_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-get-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-on-facebook_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_off00005211.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5211 25064 bytes
SHA-256: 9d64dcb3ccb5d2728051f21dd48b031a6495a59e400ca2efbef3dd3429cfde14
font_01_sfnt_off00008b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B1B 18296 bytes
SHA-256: 279b0b1c893eba727ec0845632f3a3712edc40ddf848fb82c48fddf2681f3228

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