Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc7f77ea4d5a2714…

MALICIOUS

PDF

34.9 KB Created: 2021-07-06 02:06:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e25b35d8be7065f91dd4841ef9142ea8 SHA-1: 727086020ac7cb493c3509b7622ea814d9424f24 SHA-256: bc7f77ea4d5a27147fb4cc9abe0e4f6355feb389dc7d1f39dba61b4231c5db0d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector, masquerading as a generator for game hacks and free spins. The document body and embedded URLs strongly suggest a lure for users seeking in-game advantages, which is a common social engineering tactic. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/free-coin-master-spins-link-game-hack In PDF document text
    • https://doingimc.com/image/data/files/coin-master-vip-hack_GM406889139.pdfIn PDF document text
    • https://doingimc.com/image/data/files/free-spin-link-of-coin-master_GM406889139.pdfIn PDF document text
    • https://doingimc.com/image/data/files/coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • https://doingimc.com/image/data/files/roblox-com-hack-account_GM431946152.pdfIn PDF document text
    • https://doingimc.com/image/data/files/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • https://doingimc.com/image/data/files/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://doingimc.com/image/data/files/how-to-steal-roblox-shirts-free-bc_GM431946152.pdfIn PDF document text
    • https://doingimc.com/image/data/files/how-to-use-scripts-in-roblox-hack_GM431946152.pdfIn PDF document text
    • https://doingimc.com/image/data/files/roblox-hack-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://doingimc.com/image/data/files/minecraft-hack-2021_GM479516143.pdfIn PDF document text
    • https://doingimc.com/image/data/files/minecraft-pe-apk-download_GM479516143.pdfIn PDF document text
    • https://doingimc.com/image/data/files/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://doingimc.com/image/data/files/minecraft-ps3-free-download_GM479516143.pdfIn PDF document text
    • https://doingimc.com/image/data/files/gem-hack-kat-roblox_GM431946152.pdfIn PDF document text
    • https://doingimc.com/image/data/files/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • https://doingimc.com/image/data/files/minecraft-windows-10-edition-unlock-full-game-free_GM479516143.pdfIn PDF document text
    • https://doingimc.com/image/data/files/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://doingimc.com/image/data/files/free-robux-no-download_GM431946152.pdfIn PDF document text
    • https://doingimc.com/image/data/files/how-to-get-daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://doingimc.com/image/data/files/minecraft-kill-aura_GM479516143.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_002_off000031b6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31B6 23112 bytes
SHA-256: ed4c6f61eba4e110a2738e03dc68ae77994a1e1a80330c7443d9fa9cfd0ba3e0
font_01_sfnt_off0000657d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x657D 18344 bytes
SHA-256: e5708adc55f341f1815264f824e66db99aea16b99fe97f5a0313ff5db2d8cb38

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