Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ec33d41d4f94af…

MALICIOUS

PDF

34.4 KB Created: 2021-07-06 14:59:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: bebbfef97bf93806dfe8908571556aac SHA-1: aaa5b249cb6cadbcc272b603e868100e174df5a6 SHA-256: 39ec33d41d4f94af42b70de972f2d41cd151142aff8317f0e2a467e1dd0160cb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to a lure for game hacks and generators. The embedded URL, http://netcdn.tw/app/406889139/free-spin-coin-master-instagram-game-hack, is associated with known malicious infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a social engineering tactic to redirect users to potentially harmful content, likely as part of a phishing or scam campaign.

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-spin-coin-master-instagram-game-hack In PDF document text
    • https://edu.kyst.com.tw/image/data/files/is-pubg-uc-hack-possible_GM1330123889.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/robux-hack-proof_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/roblox-cbro-cheat-spots_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/roblox-mm2-free-weapons-exploit_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/pokemon-go-free-and-verizon_GM1094591345.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/cheats-for-royale-high-school-on-roblox_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-robux-no-email_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-coin-master-credit_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/minecraft-xbox-360-free_GM479516143.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/minecraft-education-free_GM479516143.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/hack-version-of-coin-master_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/how-much-tiktok-free-account_GM835599320.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/barren-roblox-hack_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-robux-gift-card-codes-unused-2021_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-robux-no-human-verafaciton_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
font_00_sfnt_off00002f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F4D 23072 bytes
SHA-256: 9e607ca0a13de6d7f8d3bd8e170ca2d0610326640d15bcc0af2304693ed62b89
font_01_sfnt_off00006343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6343 18432 bytes
SHA-256: 6239b29cefe2ef645b0ddfa2e4a48b335d7d861794539a50a9bab712691d9f2e

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