Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fbdad71702e905e…

MALICIOUS

PDF

42.2 KB Created: 2021-05-10 18:08:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a4b795088104ac9168b1a7c27df0a149 SHA-1: 85bf388c7389564ed357d4dbcc7e15dc44240d0c SHA-256: 4fbdad71702e905eaf01b9f97baa38b26e98fd98569d0b9c5feae3174476a1d5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded URLs and a heuristic firing for an external URI, indicating a malicious intent to redirect users. The document body, though partially corrupted, suggests a lure related to 'free spins' for a game, likely a social engineering tactic to encourage clicks on the malicious links. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or malware distribution attempt.

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/free-spins-link-in-coin-master-2021-game-hack In PDF document text
    • http://repository.unla.ac.id/repository/http-bit-ly-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/can-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-roblox-toys_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/minecraft-ps3-free-download_GM479516143.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coinmaster-free-spins-link_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/daily-spin-and-coin_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/robux-generator-com_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/robux-miner_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/oprewards-com-robux_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-free-spin-redeem-code_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-free-fire_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-download-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/send-me-500-2021-spins_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-hack-people-on-roblox_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_off000049e9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49E9 24400 bytes
SHA-256: 967512d5e3dc29ec1a259a8df4ed935f4ab69ab9f2702b1a0161a2db66a3d260
font_01_sfnt_off000081d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81D6 18456 bytes
SHA-256: 8f5be0faf1f43547a4f613946690c49555a623d75ecb5c591eda2449b2cabce1

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