Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c1fb349d613eaa…

MALICIOUS

PDF

44.3 KB Created: 2021-06-03 22:15:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 2317aea7ec36332225ae28b5a00586ea SHA-1: 8828b6024ee6808d9a1f55ecfa55994e6c77b138 SHA-256: b8c1fb349d613eaaa5790df29c6b1badbc0a734bbcde0ce026489b8b4d653729
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links designed to lure users into clicking on "free generator" or "free spins" content. These links redirect to known malicious infrastructure, specifically a URL associated with game hacks and free spins. The document body and embedded links suggest a phishing or scam attempt to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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-free-spins-twitter-game-hack In PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-spins-app-android_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/freer-pro-tiktok-fans_GM835599320.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/haktuts-coin-master-free-spin-link-today_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-foxy-food_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/freerobux-co_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-minecraft-capes_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-hack-pro_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-hack-a-minecraft-account_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/minecraft-pe-mod-menu_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-unlimited-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-com-free_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-hack-spins-and-coins-unlimited-free_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_off00004ddb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DDB 26608 bytes
SHA-256: 2a3c8f60888151319e396dcbc182b240347058a0d111e0d29c86f38a163fb151
font_01_sfnt_off00008b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B51 18052 bytes
SHA-256: c7a08897dda8fd7aa1aaa0c20f8df2a538a05673267b13c95f426f14bc7355df

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