Malicious PDF — malware analysis report

Static analysis result for SHA-256 7638190125f81368…

MALICIOUS

PDF

48.8 KB Created: 2021-06-09 15:39:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 03291a8aed7a394a25cd9ac9cdd4b1dc SHA-1: 2d27fe103561f5315dfcfbdd7272a15a5176b567 SHA-256: 7638190125f81368c0ccd92cd95afd6f803477235c23dfd7ae7d5ffc9738129e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links to known malicious redirectors and lures users with promises of game hacks. The ML classifier also flagged this PDF as malicious. The primary link leads to a page that likely serves further malicious content or downloads.

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/hack-para-atravesar-paredes-rn-roblox-game-hack In PDF document text
    • https://www.polyfin.de/images/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • https://www.polyfin.de/images/roblox-diamond-hack_GM431946152.pdfIn PDF document text
    • https://www.polyfin.de/images/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://www.polyfin.de/images/free-tiktok-engagement-calculator_GM835599320.pdfIn PDF document text
    • https://www.polyfin.de/images/roblox-cr-r-free_GM431946152.pdfIn PDF document text
    • https://www.polyfin.de/images/how-to-sue-roblox_GM431946152.pdfIn PDF document text
    • https://www.polyfin.de/images/how-to-hack-coin-master-ios-jailbreak_GM406889139.pdfIn PDF document text
    • https://www.polyfin.de/images/coinmaster-blogspot_GM406889139.pdfIn PDF document text
    • https://www.polyfin.de/images/comment-installer-un-cheat-sur-cbro-roblox-franais_GM431946152.pdfIn PDF document text
    • https://www.polyfin.de/images/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://www.polyfin.de/images/lazyblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.polyfin.de/images/roblox-hack-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.polyfin.de/images/coin-master-level-3_GM406889139.pdfIn PDF document text
    • https://www.polyfin.de/images/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • https://www.polyfin.de/images/today-coin-master-spin-free_GM406889139.pdfIn PDF document text
    • https://www.polyfin.de/images/obby-free-robux-elevanoz_GM431946152.pdfIn PDF document text
    • https://www.polyfin.de/images/hacks-in-roblox-booga-booga_GM431946152.pdfIn PDF document text
    • https://www.polyfin.de/images/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • https://www.polyfin.de/images/coin-master-hack-2021-android_GM406889139.pdfIn PDF document text
    • https://www.polyfin.de/images/pokemon-go-free-100-iv-coordinates_GM1094591345.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_off000052aa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52AA 26500 bytes
SHA-256: 448f3a05d91e09fcf8ef56e486f6f0ff0d3053469313362564428621246a5965
font_01_sfnt_off00008dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DC9 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off00009a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A71 18728 bytes
SHA-256: 5d7a4842810ad1fa074a01290a039af93b3b6c1f6030f1c2a11f69f395390052

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