Malicious PDF — malware analysis report

Static analysis result for SHA-256 cafcf390a504bc11…

MALICIOUS

PDF

33.9 KB Created: 2021-07-03 18:54:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d21989c5305698829d16be7844e32c70 SHA-1: ebcb70adde5d54698780a90c2d860875faab96db SHA-256: cafcf390a504bc11e24661fa3377652497ed47f5c8ae26fbf85a1607c788fd6e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically advertising 'free generators' and 'game hacks' for popular games. The primary lure URL is http://netcdn.tw/app/479516143/minecraft-for-free-games-game-hack, which is designed to trick users into clicking through to potentially harmful content. While no scripts were extracted, the presence of embedded URLs and the heuristic firings strongly indicate a social engineering tactic to drive traffic to malicious infrastructure.

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/minecraft-for-free-games-game-hack In PDF document text
    • http://lib.teknik.unimal.ac.id/repository/how-to-get-free-shirts-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/coin-master-free-spins-and-coins-hack_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/roblox-hack-999999-robux-android_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/free-exotics-roblox-assassin_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/how-to-do-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/tiktok-free-folowers-free_GM835599320.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/follower-bot-roblox-free_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/free-roblox-gift-card-codes-not-used-2021_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/roblox-free-clothes-download_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/robux-robians-robuxs-hack_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/free-robux-no-human-verification-download_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/roblox-icebreaker-hack_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/new-roblox-exploit-hack_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/coin-master-free-rare-cards_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/free-robux-without-any-verification_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
font_00_sfnt_off0000306b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x306B 22496 bytes
SHA-256: 4c29b31f89c4d79ccc866aa88fbc105673dc29d3a54e57344edb28deb720d04a
font_01_sfnt_off000061ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61CE 18260 bytes
SHA-256: 253101e49709f7aa7821dbc40117ac29270749785d2b8ec4300bbc18b36243b7

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