Malicious PDF — malware analysis report

Static analysis result for SHA-256 937bfc9c55ff2026…

MALICIOUS

PDF

36.0 KB Created: 2021-07-03 13:22:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 55d6b3f89ff29a65e43e50cddc44b124 SHA-1: bea9f1a7efbdffd73a4227f39133b77eaf6e007f SHA-256: 937bfc9c55ff20261709616e7e1e00f57d60290b1b6f7f0b7ccccc9b5a27b25e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, specifically promoting game hacks and cheats. The document body and heuristics indicate a lure for users to download potentially unwanted or malicious software. No scripts were extracted, but the primary attack vector appears to be social engineering via deceptive links.

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-332-apk-free-download-game-hack In PDF document text
    • https://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/coin-master-hack-online-without-human-verification_GM406889139.pdfIn PDF document text
    • https://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/coin-master-free-spins-may-11-2021_GM406889139.pdfIn PDF document text
    • https://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/how-to-get-free-shields-on-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/free-coin-master-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/how-to-hack-coin-master-in-pc_GM406889139.pdfIn PDF document text
    • https://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/roblox-getting-hacked_GM431946152.pdfIn PDF document text
    • http://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/roblox-game-free-download_GM431946152.pdfIn PDF document text
    • https://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/games-like-minecraft-but-free_GM479516143.pdfIn PDF document text
    • http://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/roblox-paint-n-guess-cheat_GM431946152.pdfIn PDF document text
    • https://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/www-rbx-com_GM431946152.pdfIn PDF document text
    • https://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/how-to-get-free-cloathes-in-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/coin-master-hack-game_GM406889139.pdfIn PDF document text
    • http://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/roblox-hack-for-change-music_GM431946152.pdfIn PDF document text
    • https://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/roblox-free-mods_GM431946152.pdfIn PDF document text
    • https://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/commande-roblox-cheat_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_off00003403.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3403 22888 bytes
SHA-256: 4aedf7ecf9731846d013c0720fa6857d99f14a4e4a06fad4d3a9bdb1638a21eb
font_01_sfnt_off00006751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6751 19220 bytes
SHA-256: bf59091efa353dbb747a150d838aec14b57f32070b3d7fb07058a04f7f2fa4fa

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