Malicious PDF — malware analysis report

Static analysis result for SHA-256 657088fec72d689c…

MALICIOUS

PDF

35.5 KB Created: 2021-07-01 22:35:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: dc60f18eea5b9bb364f6ad15ccf3f662 SHA-1: 81bce9691c2a81c7c3dd25667ff5b6e6fdcf8c43 SHA-256: 657088fec72d689c2339161958e75c1d2c1e33a61dacf4dd0d4fea4208bd6ee0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains lures for game hacks and free robux, directing users to a known malicious redirector. The embedded URLs and document content strongly suggest a phishing or scam attempt designed to lead users to potentially harmful websites. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of malicious intent.

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.co/app/431946152/roblox-mobile-hacks-4-free-robux-game-hack In PDF document text
    • https://xiangquan.com.tw/image/data/files/hack-coin-master-apk-33_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/robux-hack_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/get-free-roblox_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-to-hack-people-in-roblox_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/roblox-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/hack-roblox-redeem-card_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-roblox-gift-card-codes-workind-in-2021_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/cheats-coin-master-free_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/arsenal-roblox-hacks-pasebin_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-jailbreak-money-roblox_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/minecraft-free-ios_GM479516143.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/hack-para-jailbreak-2021-roblox-de-sontix_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/unlimited-coin-master-free-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
font_00_sfnt_off0000323d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x323D 22816 bytes
SHA-256: a97ef7c94bfb839cf47f1c8e3e2d30b61511c53ca086103e9f3438c21f308662
font_01_sfnt_off0000651f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x651F 19336 bytes
SHA-256: 993f7e748661c88a0f1835155e7fe49e95ece9b70c86c3d1bf8520d3488df85b

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