Malicious PDF — malware analysis report

Static analysis result for SHA-256 273844e973c19cf8…

MALICIOUS

PDF

45.3 KB Created: 2021-06-08 03:09:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 2d6fa64a94d7587157a52665030931e9 SHA-1: 13687640fe7902fe4d5a59be3706a5d505ef420e SHA-256: 273844e973c19cf88e862b49a9868b49aa80d33dc37d93d80668bcd72a6ed8d3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector, specifically designed to lure users with promises of game hacks and free items. The primary URL, https://netcdn.tw/app/431946152/get-free-account-roblox-2021-game-hack, is identified as a game hack redirector. The document body, though partially obfuscated, contains similar lures and references to the malicious URL. The presence of multiple embedded URLs and the critical heuristic firings strongly indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/get-free-account-roblox-2021-game-hack In PDF document text
    • http://acp-institut.fr/images/free-spin-online-tool-coin-master_GM406889139.pdfIn PDF document text
    • http://acp-institut.fr/images/tiktok-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://acp-institut.fr/images/minecraft-free-download-android-apk-014-0_GM479516143.pdfIn PDF document text
    • http://acp-institut.fr/images/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • http://acp-institut.fr/images/coin-master-free-snacks-link_GM406889139.pdfIn PDF document text
    • http://acp-institut.fr/images/how-to-hack-people-in-roblox_GM431946152.pdfIn PDF document text
    • http://acp-institut.fr/images/usar-hacks-en-roblox_GM431946152.pdfIn PDF document text
    • http://acp-institut.fr/images/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • http://acp-institut.fr/images/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • http://acp-institut.fr/images/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://acp-institut.fr/images/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://acp-institut.fr/images/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://acp-institut.fr/images/tryrbx-site-free-robux_GM431946152.pdfIn PDF document text
    • http://acp-institut.fr/images/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://acp-institut.fr/images/coin-master-money-hack_GM406889139.pdfIn PDF document text
    • http://acp-institut.fr/images/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • http://acp-institut.fr/images/coin-master-cheats_GM406889139.pdfIn PDF document text
    • http://acp-institut.fr/images/roblox-robux-hack-no-survey-no-password-no-download_GM431946152.pdfIn PDF document text
    • http://acp-institut.fr/images/free-minecraft-alt-accounts_GM479516143.pdfIn PDF document text
    • http://acp-institut.fr/images/coinmaster-spins_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_off00004fd2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FD2 26140 bytes
SHA-256: f5064bbbd608ea1f0be47c67aa627a3a7cfac14c26abd6914f523c403ba15cdd
font_01_sfnt_off00008d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D52 18596 bytes
SHA-256: 3362fbe2bde6942cbad40afd43a2156737495580931f5442a71afa20d535e1c9

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