Malicious PDF — malware analysis report

Static analysis result for SHA-256 77899e4083f8b56c…

MALICIOUS

PDF

34.3 KB Created: 2021-07-03 18:00:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 75cc173ddc786f5fa5933adc38168068 SHA-1: c86b070567b3ec9a574c8a0e41bb8fef7728cfbc SHA-256: 77899e4083f8b56c5510a2fcf0d3b12506404df1b4fe64eca639ade06ca5040f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, masquerading as game hack generators or cheats. The primary lure URL is http://netcdn.tw/app/479516143/how-to-get-free-coins-in-minecraft-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or social engineering attack aimed at redirecting users to potentially harmful content. The ML classifier also flagged this PDF with high confidence.

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/479516143/how-to-get-free-coins-in-minecraft-game-hack In PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/roblox-promo-codes-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/cm-spin-link_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/roblox-www-com_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/coinmaster-spin-ml-free_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/coin-master-free-spins-cheats_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/pokemon-go-free-promo-code_GM1094591345.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/coin-master-fan-page-giveaway_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/earn-robux-websites_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/optifine-mcpe_GM479516143.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/is-minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/free-modded-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/free-robux-scams_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/tiktok-free-online_GM835599320.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/free-pet-food-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/google-moon-active_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/coin-master-free-spins-link-haktuts_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/tiktok-watch-free-movies_GM835599320.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/get-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000031fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31FB 22444 bytes
SHA-256: 4a95ae92aef902b103a284290314ae73884b1c9587b1b05964a2fcbf04e28a7a
font_01_sfnt_off000063fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63FD 18164 bytes
SHA-256: f32702da776c8ff4ea7f35a590c5b2ee8a570aeb9e2a06cdd3974055a00b8054

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