Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4214f10b3855c6…

MALICIOUS

PDF

44.6 KB Created: 2021-06-11 02:56:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3a08bbc41cf48d6009118f42c4bcd838 SHA-1: 1e7f5df82cfd713bbc254eb3fe8d632ea3dc262c SHA-256: cc4214f10b3855c601c4d4e7f2686608278267bbb29834fe9f62815b0bef1eab
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free robux'. The ML classifier strongly flagged this PDF as malicious, and the embedded URLs are associated with known redirectors. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or scam attempt, likely leading to further malware download or credential harvesting.

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.tw/app/431946152/roblox-free-promo-codes-2021-game-hack In PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-money-cheat-engine_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-get-free-20210-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-free-spins-hack-download_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/hack-tiktok-fans-free_GM835599320.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-spins-for-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/hack-roblox-now_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/spin-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-invite-friends-free-spins_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/apps-for-free-robux_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_004_off00004ee5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EE5 25640 bytes
SHA-256: 2e7f523666b784a9f8efe92faf4c460bfea6088b054aefd647ff261ca73c6bc1
font_01_sfnt_off000089c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89C0 18936 bytes
SHA-256: f64c35e31382287e9849d1d5f9c8033278f8141d4a6b1c9f1a69cb33c2c8f23e

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