Malicious PDF — malware analysis report

Static analysis result for SHA-256 df5942a87329c122…

MALICIOUS

PDF

45.0 KB Created: 2021-06-08 16:22:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 3aafa6b89d27544b0313b66e94270ad5 SHA-1: d3126bab7e1d39d85f72926d532d94d7fc8b2f91 SHA-256: df5942a87329c1228f005e5c2aac79b540495847fadb43234e4bcef6faad0925
200 Risk Score

Malware Insights

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

This PDF document employs a lure related to game hacks and generators, impersonating the Amazon brand to trick users. It contains multiple links that redirect to malicious infrastructure, specifically `https://netcdn.tw/app/431946152/pastebin-headless-horseman-free-roblox-game-hack`. The presence of multiple redirector links and the ML classifier's high confidence score indicate a malicious intent to lead users to potentially harmful content or further exploits.

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/pastebin-headless-horseman-free-roblox-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/pastebin-headless-horseman-free-roblox-game-hack In PDF document text
    • http://centr-expert.su/images/cheat-boku-no-roblox_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/coin-master-server-hack_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/roblox-free-roblox_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/minecraft-free-exe_GM479516143.pdfIn PDF document text
    • http://centr-expert.su/images/roblox-password-hacker_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/robux-generator-that-works_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/roblox-hack-me_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/coinmasterdailyfreespins-com_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/how-to-get-free-robux-i-m-not-even-kidding_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://centr-expert.su/images/was-minecraft-ever-free_GM479516143.pdfIn PDF document text
    • http://centr-expert.su/images/old-roblox-accounts-for-free_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/roblox-com-free-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_004_off0000522f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x522F 24740 bytes
SHA-256: c85346308c7d8cb134fc937447ae418fc51b0898a610d38a665ba0238fc12736
font_01_sfnt_off00008b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B6B 18988 bytes
SHA-256: 3e0712db0a9175ca240977bda9488f88d4bbfbc0a42c4afc5bd114a5d5ae1b79

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