Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c640e8e6c1719d4…

MALICIOUS

PDF

33.9 KB Created: 2021-07-05 20:49:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 90ab0d27aaa8e2917499a99761088d33 SHA-1: 81c81e760f8051802cafceda83009702d06e711b SHA-256: 1c640e8e6c1719d415c8c795d7c45a6ff50f51dd75d27412b2e10312411fed6e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector infrastructure, specifically advertising 'free generator / game hack' lures for popular games. The primary link, http://netcdn.tw/app/406889139/coin-master-free-spins-without-verification-game-hack, is flagged as a known malicious redirector. This suggests the document is designed to trick users into visiting potentially harmful sites, likely for credential harvesting or further malware delivery.

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/coin-master-free-spins-without-verification-game-hack In PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/roblox-hack-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/coin-master-apk-hack-2021-ios_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/hack-coin-master-dzooka_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/download-synapse-roblox-hack-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/free-robux-group_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/minecraft-alt-accounts-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/coin-master-spin-link-hack_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/roblox-play-now-for-free-no-download_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/roblox-troll-outfits-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/earn-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/coin-master-hack-online-without-human-verification_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/free-robux-codes-not-used_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/coin-master-daily-gifts_GM406889139.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_off00002ded.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2DED 22480 bytes
SHA-256: f5e6fdae71e9e23e36668835efc76a5b0efbb50bca2cfc8fe139ba3d265d5837
font_01_sfnt_off00006036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6036 18812 bytes
SHA-256: efebb9ab85318ef2fcc466b1ba77fdbcbd0ba4e561c4fe4ef6f775257a73b700