Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d8c5f116388142…

MALICIOUS

PDF

42.0 KB Created: 2021-05-12 21:47:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 457704324dd43baa823b786fba5d7647 SHA-1: 6b60c52610f45b492d430b57a60af1f5627b1a1c SHA-256: c9d8c5f116388142f57f965485e18118b97ce63e71a1722b2678bf9fbf1f37e9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites that promise free game-related items, such as 'Coin Master Hack' and 'Robux'. These links are identified as malicious redirectors, indicating a likely scam or phishing attempt. The ML classifier also flagged the PDF with high confidence, supporting its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/coin-master-hack-apk-no-survey-game-hack In PDF document text
    • http://promotion.si/images/coin-master-rewards-2021_GM406889139.pdfIn PDF document text
    • http://promotion.si/images/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://promotion.si/images/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://promotion.si/images/getrobux-ninja_GM431946152.pdfIn PDF document text
    • http://promotion.si/images/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • http://promotion.si/images/minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • http://promotion.si/images/win-free-robux_GM431946152.pdfIn PDF document text
    • http://promotion.si/images/robux-link_GM431946152.pdfIn PDF document text
    • http://promotion.si/images/free-unlimited-coin-master-online-tool_GM406889139.pdfIn PDF document text
    • http://promotion.si/images/free-google-play-promo-codes-coin-master_GM406889139.pdfIn PDF document text
    • http://promotion.si/images/roblox-play-now-for-free_GM431946152.pdfIn PDF document text
    • http://promotion.si/images/minecraft-java-edition-free-download-for-android_GM479516143.pdfIn PDF document text
    • http://promotion.si/images/roblox-free-no-download_GM431946152.pdfIn PDF document text
    • http://promotion.si/images/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://promotion.si/images/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://promotion.si/images/coin-master-hack-tool-exe_GM406889139.pdfIn PDF document text
    • http://promotion.si/images/coin-master-computer-hack_GM406889139.pdfIn PDF document text
    • http://promotion.si/images/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://promotion.si/images/hack-coin-master-free_GM406889139.pdfIn PDF document text
    • http://promotion.si/images/spin-link_GM406889139.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
stream_003_off000048ed.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48ED 24604 bytes
SHA-256: 79fc0b5aa18a2f72ffd060d9323711bd807fde271f4e019523938d7453783f7d
font_01_sfnt_off0000817c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x817C 18328 bytes
SHA-256: 44ce5971fd5edf6fbd4f1d011f246de402cc390c11e0c8a7f8b59bac61d46267

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