Malicious PDF — malware analysis report

Static analysis result for SHA-256 5752e6d556aa2386…

MALICIOUS

PDF

46.6 KB Created: 2021-06-03 05:17:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: ece59e99b5ca93c4b77f454a185e9dd7 SHA-1: 6a27538999d172b31b219e5c3701898b443a6d61 SHA-256: 5752e6d556aa238603dd9123b4e3c3aa00415d59ddaacd62be4ff160a992b013
200 Risk Score

Malware Insights

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

The PDF document contains a critical heuristic firing for a malicious redirector link, specifically pointing to a "game hack" generator. The document body, though heavily obfuscated, contains references to the same URL. The presence of a fake CAPTCHA heuristic suggests a social engineering tactic to trick the user into interacting with the malicious link, likely leading to further exploitation or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.online/app/431946152/robux-sign-game-hack In PDF document text
    • https://www.wcauk.org/uploads/files/files/https-iosgodscom-topic-20214coinmasterhack_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/coin-master-free-spins-link-2021-haktuts_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/free-realistic-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/coin-master-hack-game-download_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/avatar-roblox-game_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/pokemon-go-free-7km-egg-list_GM1094591345.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/free-100-robux_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/free-tiktok-likes_GM835599320.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/daily-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/microsoft-roblox-rewards_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/haktuts-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/blox-fun-info_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/coin-master-strategy_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/freegames911com-coinmastertipsandcheats2021freecoinsandspins_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/hey-google-how-do-you-get-free-robux_GM431946152.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_off00005210.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5210 28620 bytes
SHA-256: df2860d06ec98c2d2043d48a85fafc49ce2fced61169d7943b7de166302b57c0
font_01_sfnt_off000093e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93E7 18260 bytes
SHA-256: d979ccd66367cffe0923c7c168b8d9239fab8865d1d9d8d0be6a8c4d84c57473

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