Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4dea790cee158a…

MALICIOUS

PDF

46.1 KB Created: 2021-06-09 02:56:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: f761919472fa78f5972b0eaf96327e3c SHA-1: 6a6546897c5d1e458838b3b36965e9675bf8f114 SHA-256: 9f4dea790cee158a914844f9f71c33d0abd7cddfd6b324fa09be5fbb37b225c0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to known malicious infrastructure, specifically promoting 'free generator' or 'game hack' lures. The primary URL identified is https://netcdn.tw/app/431946152/como-obtener-robux-gratis-sin-hackear-game-hack. This indicates a social engineering attack aimed at tricking users into visiting potentially harmful sites. No scripts were extracted, but the embedded URLs and heuristic firings strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/como-obtener-robux-gratis-sin-hackear-game-hack In PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-daily-rewards-link_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-imagine_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/girl-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-rewards_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-hack-online-download_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/abd-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/roblox-images_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/lazyblocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-free-snacks-in-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-spins_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-executor-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-roblox-game-no-dowload_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-card-hack-2021_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_off00005221.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5221 26584 bytes
SHA-256: 49c0fa6b1034a51bc5f2f583425e0ccadb4fe4f997edcdb40f842c6b70f691a5
font_01_sfnt_off00009041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9041 18732 bytes
SHA-256: 6d44f6cc93f1043ee4cb7c79e64dc1b0aa36864f930401c7451eef879e41c1ed

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