Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a4d5fdb5cbfd9e…

MALICIOUS

PDF

34.2 KB Created: 2021-07-05 15:32:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a8a60dc448920ddc92c2b88b998ac53c SHA-1: ac7d155707035f5fd1dde4f893c36f17f8256c7a SHA-256: b8a4d5fdb5cbfd9e7ff2a1f3be49a05ba556a0b095e33ea615b892a79c7234b8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, including one pointing to 'netcdn.tw', which is flagged as a suspicious external URI. The document body explicitly mentions 'Free Links For Coin Master' and includes a call-to-action phrase, suggesting a lure for potentially unwanted or malicious downloads. 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/406889139/free-links-for-coin-master-game-hack In PDF document text
    • http://perpus.stmik-im.ac.id/repository/roblox-free-dino-hat_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/fly-hack-roblox-jail-break_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/pants-free-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/proxo-cheat-in-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/roblox-magnet-simulator-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-robux-app-real_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/dragon-ball-legendayr-powers-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/minecraft-java-edition-free-code_GM479516143.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/roblox-hacks-and-cheats_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-bikini-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/get-free-robux-just-by-joining-this-group_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/roblox-scrip-super-poderes-no-hacks_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/mac-roblox-cheat-engine_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/roblox-free-brick-pants_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/rbxoffers-com-free-robux_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_off000030d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30D9 22612 bytes
SHA-256: b05c2f9a15508eda59b73a4b0a37936885468e251a3f93c8232b811170238967
font_01_sfnt_off0000633d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x633D 18168 bytes
SHA-256: 4fd4acee7e61db1e46350db43a8aa18a4e40f59134fdf79b97aaab2dfd194894

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