Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77fbab9e0223fe9…

MALICIOUS

PDF

35.8 KB Created: 2021-07-06 05:31:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 784bbf0a56a970a5af4ad269bb3ab475 SHA-1: df97de0fffc3021a67b35c48a32f761cc459fa33 SHA-256: f77fbab9e0223fe980bd29697f32aca496aeed9781d508667b2766f37f30f4cc
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a call-to-action phrase, strongly suggesting a phishing or scam attempt. The ML classifier also flagged this PDF as malicious. The primary URL, http://netcdn.tw/app/406889139/moonactive-coin-master-free-spins-link-game-hack, appears to be the intended destination for the lure. No scripts were extracted, but the presence of external URIs and the ML classification indicate a high likelihood of malicious intent.

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.tw/app/406889139/moonactive-coin-master-free-spins-link-game-hack In PDF document text
    • http://digilib.stimata.ac.id/repository/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/how-to-get-girl-hair-on-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/roblox-free-executor_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-robux-link_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/how-to-get-100-robux-for-free_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-gold-cards-hack-english_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-robux-no-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-free-spins-11-01-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/magitan-roblox-hack_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/pastebin-robux-2021-hack_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-robux-gift-card-generator_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_002_off00003525.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3525 22972 bytes
SHA-256: 5f46813614e7f62510b55dc32386ce56df9088ff85f0772f1e8740d94ea42016
font_01_sfnt_off000068a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68A9 18460 bytes
SHA-256: 2883425220e913a7562a99f4ec338813a638a2cee0d7b623b8123d2cd5a34c9f

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