Malicious PDF — malware analysis report

Static analysis result for SHA-256 daad41a2b255ffb7…

MALICIOUS

PDF

48.5 KB Created: 2021-06-09 17:18:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e41751d73840beb958cb4f4b591c72bc SHA-1: e8aaad461eb32f9cf825096fe1326691a5be97a1 SHA-256: daad41a2b255ffb74b60b781252b500d708fe109710970a763ef2d206f41adc7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to malicious infrastructure, masquerading as game hacks or generators. The primary lure URL is https://netcdn.tw/app/431946152/roblox-dinosaur-simulator-hack-2021-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious redirector workflow designed to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/roblox-dinosaur-simulator-hack-2021-game-hack In PDF document text
    • https://verstricktundzugenaeht.com/images/free-roblox-girl-hair-not-a-model_GM431946152.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/lastrick-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/google-roblox-games_GM431946152.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/hacker-shirt-roblox-id_GM431946152.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/100-robux-for-free_GM431946152.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/minecraft-menu_GM479516143.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/coin-master-free-spins-youthnow_GM406889139.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/coin-master-email-rewards_GM406889139.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051f5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51F5 24868 bytes
SHA-256: 199cd821dea912a10de95afc5fd5d627a50df34e42190e61dbc27f434bb15f7d
font_01_sfnt_off00008b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B48 3464 bytes
SHA-256: 8e24205afdd13dcdea98f8150ef77dee4030e0e50a7c748783d1b4598e034a20
font_02_sfnt_off0000977e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x977E 19376 bytes
SHA-256: e88d0b91dba64c9e82c526915f389ed983c33aeec2f4784c12138522cd42d3a8

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