Malicious PDF — malware analysis report

Static analysis result for SHA-256 778fe1c098e70a3e…

MALICIOUS

PDF

43.6 KB Created: 2021-05-16 08:52:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b7e37b8c9d3c77ddee5cfe4568080da8 SHA-1: f8d84652e8e0a42144ac35ed00732e9d0b7fe736 SHA-256: 778fe1c098e70a3ef6f136b19c0b2b9ef0570a7557f4f5f45038bae77a790ae5
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs and a primary URL that point to sites offering game hacks and free in-game currency. The ML classifier strongly flagged this PDF as malicious, indicating it likely serves as a lure to download a second-stage payload. The document body, though heavily obfuscated, contains references to 'Robux Boost' and game hacks, reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/431946152/robux-boost-game-hack.
  • 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/431946152/robux-boost-game-hack In PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-spins-hack-2021_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/ac-market-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-computer-hack_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-free-spin-group_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-minecraft-shaders_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-free-spins-link-today-haktuts_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-coin-master-game_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-make-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-hacks-reddit_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-100-spin_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/minecraft-pe-free-download-android_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-make-clothes-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-free-spins-fb-champion_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/cm-daily-spins_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/rewardex-robux_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
stream_003_off00004a72.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A72 27392 bytes
SHA-256: a33444d52f169d268c3983709b585e1a2c922e5ea45c08c94ecee3a4e53af7c3
font_01_sfnt_off000088f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88F2 17952 bytes
SHA-256: 11074efe5b2c6d92dadef1a68c4708857388b690ee0ee43b1902778d8611b6e8

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