Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b921d6610de902…

MALICIOUS

PDF

34.1 KB Created: 2021-07-05 10:33:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 288d50aa234e7a0b85dccf63b92cef9e SHA-1: 2b1eea883804a12e596217e50d111ee1d5458c73 SHA-256: 99b921d6610de902b75835459427eb226be49786a938ef993a0cdfc3076eb6d3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to known malicious infrastructure, specifically targeting users with lures for game hacks and in-game currency. The ML classifier also flagged this PDF as malicious with high confidence. The document body and embedded URLs suggest a social engineering tactic to drive traffic to potentially harmful sites.

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/coin-master-download-hack-ios-game-hack In PDF document text
    • http://cintabaca.org/katalog/repository/roblox-robux-hack-ios_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-roblox-hack-com-free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/get-me-free-robux_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/coin-master-club-hack_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/fast-car-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-roblox-money-2021_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-robux-no-download_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-cubes-of-the-gods-hack_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/free-roblox-exploits_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/coin-master-hack-spins-ios_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/tiktok-free-followers-2021_GM835599320.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/coin-master-free-spinv1-0apkpure-com-apk_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-arsenal-hacks_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-vh2-gun-hack_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/appsmob-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/microsoft-robux_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-robux-zone_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-spins-for-coin-master-2021_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_off00002e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E90 22716 bytes
SHA-256: cda769719a94e069a6566bb3aa204681ee4925a820e87dc48ce6996ab00c24ef
font_01_sfnt_off00006174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6174 18584 bytes
SHA-256: 0cc53e6ff5965a6bde6e826f187bf2e09f3f61dfd66a91e989fd5a35dba691c6

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