Malicious PDF — malware analysis report

Static analysis result for SHA-256 d28abdf83142cd5a…

MALICIOUS

PDF

46.9 KB Created: 2021-06-03 06:03:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 7b60eb82358e2b2c08dd463e2d227e81 SHA-1: d3344f0f5721985f9efbc716778814ce29ae7d4f SHA-256: d28abdf83142cd5a2a9aeb1afb9aaa239adce13deb38589032303feb70502da4
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high-risk heuristic firing for a game hack redirect lure, pointing to a URL that promises free in-game items. The document body and embedded URLs reinforce this theme, suggesting a phishing or scam attempt to redirect users to a malicious site. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 https://netcdn.online/app/406889139/free-spins-and-coins-coin-master-app-game-hack PDF link annotation
    • http://bw.ac.th/userfiles/files/roblox-gift-card-online-free_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/pubg-uc-not-received_GM1330123889.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/free-coin-master-spins-hack_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/minecraft-pocket-edition-free-download_GM479516143.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/is-pokemon-go-free_GM1094591345.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/rbxoffers-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/minecraft-net-free_GM479516143.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/minecraft-free-education_GM479516143.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/free-robux-now_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/can-you-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051bc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51BC 25188 bytes
SHA-256: 9739db023a4d9df5cb17e0f639b192f023d738db561fa8c784cc73cfea3281e3
font_01_sfnt_off00008b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B7E 2824 bytes
SHA-256: 381f6d859be141449dd645f7be1484d2a1cf49218dc471b402dae69eaa2b11d5
font_02_sfnt_off00009521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9521 18060 bytes
SHA-256: d4954d2d00bde9f6a1061857a61d2c62c1ae360f44744af150ee923481526d51

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