Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bb691747328af4d…

MALICIOUS

PDF

41.4 KB Created: 2021-05-16 01:39:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 70cd78dccc8693c4ed6fe63b8885dde7 SHA-1: 47633024840319e0982184e834a9705b4ccb849e SHA-256: 8bb691747328af4db473b893c04ee8f407e8b2d7da308faf232da9b3c445c7f7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple embedded URLs that redirect to a 'free generator' or 'game hack' lure, specifically mentioning 'Coin Master' and 'Robux'. The heuristic firings confirm these links point to known malicious redirector infrastructure. The document body, though partially corrupted, also contains similar URLs and text related to game hacks, suggesting a social engineering attempt to trick users into visiting malicious sites or downloading further malware. No scripts were extracted, but the primary attack vector appears to be a malicious link embedded within the PDF.

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/406889139/coin-master-gift-hack-game-hack In PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/coin-master-free-daily-spins-2021_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/free-roblox-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/free-spins-coin-master-generator_GM406889139.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/free-robux-images_GM431946152.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/coin-master-game-free-play-online_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/roblox-system_GM431946152.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/coin-master-hack-apk-iphone_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/how-to-generate-free-coin-master-spin_GM406889139.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/como-descargar-coin-master-hackeado_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/coin-master-free-spins-youthnow_GM406889139.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/sites-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/coin-master-app-hack_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_off00004ac5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AC5 24060 bytes
SHA-256: 5f5b5f49efeb95a385abb3c71fb7d3934b794957e15903b012dff27341b6d2c4
font_01_sfnt_off00008110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8110 17716 bytes
SHA-256: 957a0c75666bd7c87feeac74b2953bd857188234cb967c7fff45393338fdcac0

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