Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a3a81bf64186cc8…

MALICIOUS

PDF

43.0 KB Created: 2021-05-11 05:31:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 0d059ec6224015a1f9f169307d2ea3eb SHA-1: ee3103da4d501bed7f14ae80aaedd633a6311416 SHA-256: 4a3a81bf64186cc827d7c6e484519ca5f061c553c62f470f95f494f7905eae48
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 'free generator / game hack' lures. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content. No scripts were extracted, but the document's structure and embedded links strongly suggest a phishing or scam 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 https://netcdn.xyz/app/431946152/krnl-roblox-game-hack In PDF document text
    • https://lib.unitri.ac.id//repository/tryrbx-site-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/robloxbux-us-generator_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coun-master_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-robux-please_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/i-want-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/spin-link_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-roblox-adopt-me-pets_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-coin-master-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/minecraft-18-9-hacked-client_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-free-daily-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/sb-game-hacker-coin-master_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_off00004854.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4854 26884 bytes
SHA-256: 55f4e189aea41174ca2e643ea155538a64fda3698989e1e412915d36e285792a
font_01_sfnt_off0000872f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x872F 17784 bytes
SHA-256: 7fc5638c4d6a7adf3a00de91436b89ff4a884cee4fe7182ef9800dc1feaad259

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