Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b8ec7ab276e37d…

MALICIOUS

PDF

41.7 KB Created: 2021-06-13 22:52:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 15d92b72ca1bf49238bb35852f59ffbe SHA-1: b2018ddd84a957eb5fc209fed91238f4e6d99be4 SHA-256: 81b8ec7ab276e37dea4eb9cce12d95d35bc49540b6724c44ff42a158f3ddfc5b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to malicious infrastructure, masquerading as game hacks or generators. The primary lure URL is http://netcdn.co/app/431946152/roblox-lumber-tycoon-2-hack-2021-game-hack, which is flagged as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/roblox-lumber-tycoon-2-hack-2021-game-hack In PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-free-link-daily_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/haktuts-coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-chest-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/minecraft-free-minecraft_GM479516143.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-get-free-roblox-gift-cards_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/i-didnt-get-my-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/roblox-redeem-codes-free_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-robux-exe_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/roblox-any-game-hack-download_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/optifine-pe_GM479516143.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-free-spins-link-whatsapp-group_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/i-want-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/get-me-robux_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/get-free-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-stuff-catalog-roblox_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-free-spin-27_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/hack-coin-master-apk-2021_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_003_off000046e3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x46E3 24236 bytes
SHA-256: f6a266125d2afe49e319f1ea971e5ac40f0db31ba8e7776612fe73f17b0fdf2a
font_01_sfnt_off00007de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DE3 19164 bytes
SHA-256: 802e088aef93a95d680ae304484dabeda1eaa7442163f7e5da0c68111d7ad022

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