Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa8178b0b77931a…

MALICIOUS

PDF

51.1 KB Created: 2021-06-09 10:32:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 4706a7cee4fff59d3d3c096192380b4d SHA-1: 78b7fbed4129b1db4e89f787e7bfd7eb6de32d97 SHA-256: 7aa8178b0b77931a01eb07723c00a63babe10e871e9b38c6324bcfee874cbbc6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites that are disguised as download buttons for game hacks and cheats. The primary link, https://netcdn.tw/app/431946152/descargar-hack-de-roblox-jailbreak-2021-game-hack, is identified as a malicious redirector. This suggests the document's purpose is to trick users into visiting these sites, likely to download malware or engage in other malicious activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9724

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/descargar-hack-de-roblox-jailbreak-2021-game-hack In PDF document text
    • https://xiangquan.com.tw/image/data/files/minecraft-free-download-pc_GM479516143.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-spin-hack-2021_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-minecraft-java-account_GM479516143.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/flame-gg-hack-robux_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/minecraft-hack-download_GM479516143.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/legit-coin-master-hack-october-2021_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-coin-master-spins-links-2021_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-to-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-computer-hack_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/roblox-cp_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-to-speed-hack-on-roblox-with-cheat-engine-63_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-to-hack-coin-master-root_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/rbxoffers-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-minecraft-domain_GM479516143.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-hack-cydia_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/actual-free-robux_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/mcpe-master-hack-unlimited-coins-apk_GM406889139.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_off0000555e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x555E 26912 bytes
SHA-256: 543634e55452c0794516cb1e0321db6d680e8ba0ac8c89048a91d496b9a4a844
font_01_sfnt_off000094c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94C7 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off0000a1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA1D9 19324 bytes
SHA-256: e4d6a3090b159bcee66cec9a0064c4980a215ae1b9bf1aa8e34d3bbd118a9d60

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