Malicious PDF — malware analysis report

Static analysis result for SHA-256 27e4b3ec1c665e37…

MALICIOUS

PDF

44.2 KB Created: 2021-06-14 00:07:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 9d33a7faa0afb5d85e282f807adb1db1 SHA-1: c245c8db819c2b292a3d6158cd830dc57564da8b SHA-256: 27e4b3ec1c665e3714bbc3c2a062cb02f1f573b191fbae531fdb8d37c0bf51b2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that lead to a known malicious redirector infrastructure, disguised as a 'free generator' or 'game hack'. The document body and heuristics indicate a lure for free in-game currency, likely to lead users to a phishing or malware download site. While no scripts were explicitly extracted, PDF documents can contain JavaScript for malicious actions, and the presence of multiple redirector links suggests a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.co/app/431946152/get-free-robux-without-downloading-games-game-hack In PDF document text
    • http://library.acehresearch.org/repository/free-daily-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-game_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/is-minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-hack-progamers_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-hack-apk-2021_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-fan-page_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-hack-tool-without-verification_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-german-uniform-roblox_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-play-games-that-cost-robux-for-free_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-generator_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-hack-mod-apk-unlimited-spins_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-gift-cards_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-coins_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-minecraft-accounts-reddit_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/earn-free-robux-today_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_003_off00004c3b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C3B 24816 bytes
SHA-256: ba12682631ed626fc144d01c7f5bf1b427cc871d8c2fdf3ed2054676487f7114
font_01_sfnt_off00008580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8580 19960 bytes
SHA-256: 3b58ad60256c5fdedca41a472a51f4514d38ee55b787122869efc256de95ab79

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