Malicious PDF — malware analysis report

Static analysis result for SHA-256 270a027b6cbfdcca…

MALICIOUS

PDF

44.5 KB Created: 2021-06-09 15:13:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 373130c9fe8733b2c4bcff5649293914 SHA-1: e58c2b052b3b2fde3a7123e23e6abd7c646c4c43 SHA-256: 270a027b6cbfdcca7db6872b114808ba463dbb3f2aa62a2a73d9d4945d11f8cd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for free in-game currency, directing users to a known malicious redirector. The embedded URL, https://netcdn.tw/app/431946152/free-robux-and-builders-club-generator-game-hack, is associated with malicious redirector infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/free-robux-and-builders-club-generator-game-hack In PDF document text
    • http://repository.unla.ac.id/repository/vip-roblox-free_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-robux-hack-no-human-verification-or-download_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/pubg-uc-avatar_GM1330123889.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/pubg-uc-carding-quora_GM1330123889.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-roblox-generator_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-hack-injection_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/cute-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-get-a-free-private-roblox_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-free-spin-now_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/roblox-hackprogamers-com_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-free-coins-and-spins-daily-summary_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/i-want-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/haktuts-2021-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://www.nrzroblox.comIn 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_off00004ff2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FF2 25252 bytes
SHA-256: 7b146ee862c893b6eaeb8da76b15c5722f88b18ff54cb73b44195872535b6a1f
font_01_sfnt_off00008a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A2B 18716 bytes
SHA-256: 1be51bfdd4ab5a538981e7139753a03761614881baf4839bf56c1f9344be942a