Malicious PDF — malware analysis report

Static analysis result for SHA-256 4033c52c0e6d2193…

MALICIOUS

PDF

34.0 KB Created: 2021-06-20 02:10:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: b6dd7ce58ee8994f4f5899f7ed08540e SHA-1: 3e7f7048a161825b4a28ee14e055705fe3e979a8 SHA-256: 4033c52c0e6d21939f73bbb4173d507e1391c8a3f6b271553bc749a93fb6ea65
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector infrastructure, specifically advertising 'free generator / game hack' lures. The document body and embedded URLs reinforce this theme, suggesting the primary goal is to trick users into visiting malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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-free-button-game-hack In PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-for-free_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-cheat-for-rocitizens_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/invisibility-hack-roblox-jaulbreak_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/roblox-generator-com_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-free-spins-link-2021-download_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-fire-vs-pubg-tik-tok_GM835599320.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-spins-promo-code-for-coin-master_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/lawn-mowing-simulator-roblox-hack_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-daily-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/is-there-a-way-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-2021-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/roblox-bloxburg-free-money_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/how-to-hack-coin-master-cheat-engine_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/how-to-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-games-with-free-radio_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/daily-coin-master-free-spins_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
font_00_sfnt_off0000302f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x302F 21768 bytes
SHA-256: ad6d3c7d063100c403329cdcb874f59a65b05484cd19e8434c8798311edc1244
font_01_sfnt_off00006006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6006 18896 bytes
SHA-256: 4aab0e6f39692b96477bea84ea6303055c8a06943941ff2b4bbce013ba4891d9

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