Malicious PDF — malware analysis report

Static analysis result for SHA-256 57dd6cdb148cdb0c…

MALICIOUS

PDF

35.3 KB Created: 2021-06-19 03:05:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 61d51f0111b058bda66ae0bcad8e564b SHA-1: 26b0321c0e0d016ef00bc78019952a13104a84d9 SHA-256: 57dd6cdb148cdb0ca08332a9b19513838a43200839fc46eee2b47e49ad4d1a5a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator' or 'game hack' lures. The primary redirector URL is http://netcdn.co/app/431946152/how-to-get-free-faces-on-roblox-phone-game-hack. While no scripts were extracted, the document's structure and embedded URLs strongly indicate a phishing or social engineering attack aimed at tricking users into visiting malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/how-to-get-free-faces-on-roblox-phone-game-hack In PDF document text
    • http://repository.ummy.ac.id//repository/free-roblox-passwords_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/roblox-free-hair-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/archivo-para-poner-a-roblox-para-hackear_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-free-500-spins-link_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-roblox-gfx_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/free-account-roblox-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/how-you-get-free-robux-in-roblox_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/how-to-hack-in-skywars-roblox_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-apk-hack-download_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/robux-hack-tools_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-free-spain_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-minecraft-java-edition_GM479516143.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.roblox.com/.IIn 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
font_00_sfnt_off0000329c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x329C 22532 bytes
SHA-256: 5a5cfb49e8c872ff09e2fe29c0ca705defe17e5a839e65925e33f28b9d6e75a8
font_01_sfnt_off00006490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6490 19240 bytes
SHA-256: 534aff83fdb7bcbf042ffdd0ab900e4a11b96817c3b21287553d94c5d3d1290c

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