Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c0ff7ef333f11de…

MALICIOUS

PDF

49.2 KB Created: 2021-06-08 10:12:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 98ef4f7f19aa20afdd54a445cab6b029 SHA-1: ef54a0262da6137fa3c3e5b9bc9ff5dba7cc4591 SHA-256: 0c0ff7ef333f11deba6de59576d11af936672a732fd0a04f624f3d1be60e9f3c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and lures users with 'free generator' or 'game hack' themes, indicating a phishing or scam attempt. The embedded URLs likely lead to further malicious content or exploit kits. No scripts were extracted from this sample, but the document structure and embedded URLs strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/hacked-project-pokemon-roblox-game-hack In PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/give-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/old-roblox-accounts-for-free_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-links-that-don-t-expire_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-link-daily-get-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-time-hack_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/roblox-verification_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/roblox-sign-in-free_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/pubg-uc-nasl-alnr_GM1330123889.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-much-robux-can-you-get-with-1-million-dollars_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/blogger-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/rblx-city-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000508c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x508C 27596 bytes
SHA-256: 8887ec0a1cf60267503db82569a43c3cf3599e4d1213800ea7b63d5a385ac8a8
font_01_sfnt_off000090c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90C0 2984 bytes
SHA-256: 2df87bbe4e27b27e34c872c092d0522acd977d05f5cbde7ed5e1fdfeb59cb318
font_02_sfnt_off00009b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B0E 19060 bytes
SHA-256: 853b1df821e339abf0c8b65cb0641c0b08dc7ae9a7192f3943efe59f57f24697

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