Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81f92bd147af225…

MALICIOUS

PDF

44.8 KB Created: 2021-06-09 12:54:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 4cb657efe6029f1759ee7f436e20731d SHA-1: 1538aa5124e8f1096b7bf4bb262423de46a0820a SHA-256: f81f92bd147af2250d7e4be4de8b71de1c69dcd05433b287a3e8743adb00e6da
160 Risk Score

Malware Insights

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

This PDF document contains a lure for game hacks, directing users to a malicious redirector URL. The redirector, in turn, points to other malicious PDF files hosted on a domain known for distributing malware. The ML classifier also flagged this PDF as malicious, indicating a high probability of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/download-game-roblox-hack-game-hack In PDF document text
    • http://xn--apartementos-smfora-cala-ratjada-4vc.de/images/rbxcity-free-robux_GM431946152.pdfIn PDF document text
    • http://xn--apartementos-smfora-cala-ratjada-4vc.de/images/minecraft-free-download_GM479516143.pdfIn PDF document text
    • http://xn--apartementos-smfora-cala-ratjada-4vc.de/images/hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://xn--apartementos-smfora-cala-ratjada-4vc.de/images/hack-master-coin-pc_GM406889139.pdfIn PDF document text
    • http://xn--apartementos-smfora-cala-ratjada-4vc.de/images/kuso-icu-roblox-hack_GM431946152.pdfIn PDF document text
    • http://xn--apartementos-smfora-cala-ratjada-4vc.de/images/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://xn--apartementos-smfora-cala-ratjada-4vc.de/images/roblox-username-and-pass-word-for-free-and-with-robux_GM431946152.pdfIn PDF document text
    • http://xn--apartementos-smfora-cala-ratjada-4vc.de/images/freespinandcoinblogspot-com-2021-11-coinmasterfreespins_GM406889139.pdfIn PDF document text
    • http://xn--apartementos-smfora-cala-ratjada-4vc.de/images/free-flip-master-coins_GM406889139.pdfIn PDF document text
    • http://xn--apartementos-smfora-cala-ratjada-4vc.de/images/robux-hack-me_GM431946152.pdfIn PDF document text
    • http://xn--apartementos-smfora-cala-ratjada-4vc.de/images/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • http://xn--apartementos-smfora-cala-ratjada-4vc.de/images/free-coin-and-spin-link_GM406889139.pdfIn PDF document text
    • http://xn--apartementos-smfora-cala-ratjada-4vc.de/images/how-to-earn-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://xn--apartementos-smfora-cala-ratjada-4vc.de/images/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://xn--apartementos-smfora-cala-ratjada-4vc.de/images/coin-master-hack-version-apk-download_GM406889139.pdfIn PDF document text
    • http://xn--apartementos-smfora-cala-ratjada-4vc.de/images/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://xn--apartementos-smfora-cala-ratjada-4vc.de/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://xn--apartementos-smfora-cala-ratjada-4vc.de/images/roblox-hack-scripts-pastebin_GM431946152.pdfIn PDF document text
    • http://xn--apartementos-smfora-cala-ratjada-4vc.de/images/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://xn--apartementos-smfora-cala-ratjada-4vc.de/images/coin-master-heaven-free-spins-today_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_004_off000054cb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54CB 23568 bytes
SHA-256: 37d356efe9a364d3369e4049ba81bfccd896664df6a969b93d859a70a0cca814
font_01_sfnt_off00008a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A39 18948 bytes
SHA-256: e42e628646834fe5ca359b8ada5a7071eb8f58c1451656e2cb0fe364798681fe

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