Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c3880537f175d2…

MALICIOUS

PDF

34.8 KB Created: 2021-07-07 03:53:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 80d46a125341258f365ae369ce735bf7 SHA-1: 383840e813b084486a306f42d342515731eb71bc SHA-256: 39c3880537f175d26b60c81d4b6f44a64c1b8e1a643cdfc9212f7ac4438e8129
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links designed to lure users into downloading potentially malicious content, disguised as game hacks and free currency generators. The primary malicious link identified is http://netcdn.tw/app/406889139/free-spins-and-coins-for-coin-master-game-hack, which is flagged as a known malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit user interest in free in-game items to redirect them to malicious infrastructure, likely leading to further malware downloads or phishing attempts.

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-spins-and-coins-for-coin-master-game-hack In PDF document text
    • https://www.sd-olimp.hr/files/wurst-download_GM479516143.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/how-to-hack-pokes-roblox-account_GM431946152.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://sd-olimp.hr/files/free-spin-link-coin-master-app_GM406889139.pdfIn PDF document text
    • http://sd-olimp.hr/files/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/free-robux-picture_GM431946152.pdfIn PDF document text
    • http://sd-olimp.hr/files/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/free-spin-and-coin-blogspot-com_GM406889139.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/como-pasar-el-bosque-roblox-free-pokemon-brick-bronze-beta_GM431946152.pdfIn PDF document text
    • http://sd-olimp.hr/files/is-roblox-free-on-ps4_GM431946152.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/roblox-has-been-hacked_GM431946152.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/commands-for-roblox-free-rubux_GM431946152.pdfIn PDF document text
    • http://sd-olimp.hr/files/free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://sd-olimp.hr/files/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • http://sd-olimp.hr/files/free-robux-net_GM431946152.pdfIn PDF document text
    • http://sd-olimp.hr/files/free-one-piece-roblox-character_GM431946152.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/optifine-pe_GM479516143.pdfIn PDF document text
    • http://sd-olimp.hr/files/coinmaster-spin-ml-link_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_off000032d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32D0 22644 bytes
SHA-256: 8859553e842ec2bca0025fac33d777c6333e07eb1d73421103993cdaa0838b41
font_01_sfnt_off0000652a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x652A 18348 bytes
SHA-256: e3514f5c13c59f74fe131b320bb4a7a21799b0fccf5b53c141d50f68870e844d

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