Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8efd2d21d33db03…

MALICIOUS

PDF

54.7 KB Created: 2021-06-03 07:42:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: dfce8c38d4386fe47b82ae54bb22c569 SHA-1: 5d81d0dffaf49f06d2ac527c3d3317b8c43b522c SHA-256: f8efd2d21d33db033f23ac64608a746c1fca53b1a72e835808d5fb9611cf31f2
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains multiple links to external URLs that are flagged as malicious redirectors, specifically promoting "game hacks" and "free generators." The document body and heuristic firings confirm a lure pattern designed to trick users into downloading or accessing potentially harmful content. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9497

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.online/app/406889139/coin-master-hack-ios-download-game-hack In PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-hack-tool-india_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-robux-please_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-free-coin-hack_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-minecraft-alt-generator_GM479516143.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/minecraft-pe-free-download-android_GM479516143.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/stock-speed-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/will-minecraft-dungeons-be-free_GM479516143.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-hack-tool-access-online-generator_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-hack-tool-2021_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/level-coin_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-spins-for-coin-master-on-1-19-19_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/roblox-free-wings_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000054f5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54F5 27176 bytes
SHA-256: 0a1babbbf8660f97b7277fdf47c095fe76aafdfec31602e25f41462c7c4cc70c
font_01_sfnt_off0000935c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x935C 3400 bytes
SHA-256: 75c3a8e6f5c68e0746f893c922e57fd7e888a21fb038f9ae3eedb0a197a59e24
font_02_sfnt_off00009e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E7A 8676 bytes
SHA-256: e06aca5f85e50ae6cefda302c5299c18ab6d27c174f74f0bb0ee8efa7ccb4468
font_03_sfnt_off0000b304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB304 18296 bytes
SHA-256: abb5dc3882d33bb675e42633b9ef907b5fa8a8f8ffe877e273a1ba74b2e79714

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