Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b372b21f618b8eb…

MALICIOUS

PDF

34.7 KB Created: 2021-07-06 08:44:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 22d768492b949bf9c896d7cda7ec91b7 SHA-1: 027a321de5745a49d3a92a610a666a940ef92b85 SHA-256: 7b372b21f618b8eb4abc0f765168595d56f8d37a4330b50893e47c38788452f4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising free spins for Coin Master and hacks for Roblox. The heuristic firings confirm these links point to malicious infrastructure designed to lure users with game-related cheats. While no scripts were extracted, the document body and heuristics strongly indicate a phishing or malware distribution 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.tw/app/406889139/100-free-spins-coin-master-game-hack In PDF document text
    • http://oca.undil.tl/repository/how-to-get-a-free-dominus-in-roblox-2021-march_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-executor-hack_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-dominus-free-2021_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/boku-no-roblox-remastered-hack-auto-farm_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/hacks-and-cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-iosgods_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-spins-2021-blogspot_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-obby-limited-time-only-2021_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/minecraft-windows-10-edition-free-download_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-open-proxo-roblox-hack_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/minecraft-linux-free_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-how-to-open-cheat-engine_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/rblx-gg-free-robux-without-human-verification_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
font_00_sfnt_off0000307a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x307A 23320 bytes
SHA-256: 1f4a4913cd1be8576f944e3377e466e0f84e330e033b80746186c096d2055661
font_01_sfnt_off00006474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6474 18452 bytes
SHA-256: d0c04ff51ad59f6355ad4f24aeb86ad145506544650f67de66568f082738138f

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