Malicious PDF — malware analysis report

Static analysis result for SHA-256 691ba7017e93ba05…

MALICIOUS

PDF

34.8 KB Created: 2021-07-04 11:14:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 2e3f9540ae67296c467536bbcd2dc359 SHA-1: 650127b8b25881a220c3731522fbc16ce33b7991 SHA-256: 691ba7017e93ba055a28f9a004ee325ed990577b98122c92ccb438dddd89e183
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically promoting 'game hacks' and 'free spins'. The primary redirector, http://netcdn.tw/app/479516143/simplysarc-game-hack, is flagged as malicious. The document body, though partially garbled, also contains embedded URLs that likely serve as lures for further malicious activity. The presence of these links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites.

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/479516143/simplysarc-game-hack In PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/coin-master-free-spins-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/www-cheatsk-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/generator-hack-roblox-online-pc_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/coin-master-free-coins-link-march-2021_GM406889139.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/flip-master-free-coins_GM406889139.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/roblox-v3rmillion-hacks-youtube_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/free-cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/free-robux-working_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/how-to-become-pubg-uc-seller_GM1330123889.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/40-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/roblox-how-to-get-free-robux-no-download_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/coin-master-download_GM406889139.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/earn-roblox-free_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/pokemon-go-free-game_GM1094591345.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/get-free-tiktok-followers-no-verification_GM835599320.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/free-robux-too-no-verification_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/hack-roblox-cs-go_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/this-game-has-shut-down-roblox-cheat-engine_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000330c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x330C 22444 bytes
SHA-256: d6ba6d3f34a4927b211c0084cd826a01091b850c7f834654da7d56b8227f450a
font_01_sfnt_off0000651c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x651C 18440 bytes
SHA-256: 7c23f3e3d318805df684302eb3460a013bc43601185b4b54a2bf1903bd620144

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