Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1216c028e5e780d…

MALICIOUS

PDF

45.0 KB Created: 2021-06-09 16:54:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b683c816e1953b2a26cbfff1408246ac SHA-1: 453d5a6e0efff308d5dd8f5fe63589ffe02c6579 SHA-256: e1216c028e5e780dada6db490bee3fbe976025c5e5175127c7f9e14dbd519882
200 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors and impersonates PayPal to lure users into clicking on them, likely for credential phishing or to download a second-stage payload. The embedded URLs suggest a focus on game-related scams, such as 'free Robux' generators. No scripts were extracted, but the PDF structure and heuristics indicate malicious redirection and potential exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/www-roblox-com-free-games-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.tw/app/431946152/www-roblox-com-free-games-game-hack In PDF document text
    • http://atmos-service.com/images/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://atmos-service.com/images/google-roblox-games_GM431946152.pdfIn PDF document text
    • http://atmos-service.com/images/how-to-install-minecraft-for-free-on-ios_GM479516143.pdfIn PDF document text
    • http://atmos-service.com/images/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://atmos-service.com/images/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://atmos-service.com/images/explaining-video-free-robux-and-diamonds_GM431946152.pdfIn PDF document text
    • http://atmos-service.com/images/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • http://atmos-service.com/images/free-college-textbooks-tiktok_GM835599320.pdfIn PDF document text
    • http://atmos-service.com/images/infinite-moneyz-roblox-injector-hack_GM431946152.pdfIn PDF document text
    • http://atmos-service.com/images/coin-master-spin-link-today_GM406889139.pdfIn PDF document text
    • http://atmos-service.com/images/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • http://atmos-service.com/images/is-minecraft-vr-free_GM479516143.pdfIn PDF document text
    • http://atmos-service.com/images/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://atmos-service.com/images/minecraft-java-edition-free-trial_GM479516143.pdfIn PDF document text
    • http://atmos-service.com/images/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://atmos-service.com/images/free-coin-master-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://atmos-service.com/images/how-to-make-a-roblox-group-for-free_GM431946152.pdfIn PDF document text
    • http://atmos-service.com/images/roblox-hack-bloxburg_GM431946152.pdfIn PDF document text
    • http://atmos-service.com/images/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • http://atmos-service.com/images/robux-hack-generator_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_004_off00005007.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5007 25848 bytes
SHA-256: 3275ed8def621f7dc1e233b922c2db634b1bb0dce518b7d4e625093f47984af5
font_01_sfnt_off00008bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD4 18796 bytes
SHA-256: 4185c3961cfb74b0737e063d24cc7d2d7a4b1840213f39ea3bc63e1ff0e3a225

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