Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2619def1b71b1f6…

MALICIOUS

PDF

45.2 KB Created: 2021-06-10 22:31:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: f1849dc5a3497f76dc9193ff0dcd6cb3 SHA-1: 06b773312b69ece92809ce9892cb68089da38eed SHA-256: a2619def1b71b1f676397d5b7433ba918220b0eb4934622841309208ace664c7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, masquerading as game hacks or generators. The heuristic firings indicate a malicious redirector and a lure for game-related exploits. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lead the user to a compromised site, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.tw/app/431946152/free-robux-no-download-2021-game-hack In PDF document text
    • http://dhs.or.id/new/public/ckfinder/userfiles/files/roblox-arsenal-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • http://www.dhs.or.id/new/public/ckfinder/userfiles/files/appsmob-info-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://dhs.or.id/new/public/ckfinder/userfiles/files/how-to-get-minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://dhs.or.id/new/public/ckfinder/userfiles/files/coin-master-hack-without-verification-or-downloading-apps_GM406889139.pdfIn PDF document text
    • http://dhs.or.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-daily-link-game-mod_GM406889139.pdfIn PDF document text
    • http://www.dhs.or.id/new/public/ckfinder/userfiles/files/coin-master-villages_GM406889139.pdfIn PDF document text
    • http://www.dhs.or.id/new/public/ckfinder/userfiles/files/how-to-get-minecraft-for-free-on-laptop_GM479516143.pdfIn PDF document text
    • http://www.dhs.or.id/new/public/ckfinder/userfiles/files/coin-master-golden-cards-hack_GM406889139.pdfIn PDF document text
    • http://dhs.or.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://dhs.or.id/new/public/ckfinder/userfiles/files/how-to-get-free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://dhs.or.id/new/public/ckfinder/userfiles/files/roblox-generator_GM431946152.pdfIn PDF document text
    • http://dhs.or.id/new/public/ckfinder/userfiles/files/noob-vs-pro-vs-hacker-vs-god-minecraft_GM479516143.pdfIn PDF document text
    • http://www.dhs.or.id/new/public/ckfinder/userfiles/files/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://dhs.or.id/new/public/ckfinder/userfiles/files/hack-card-collection-coin-master_GM406889139.pdfIn PDF document text
    • http://www.dhs.or.id/new/public/ckfinder/userfiles/files/how-long-is-the-minecraft-free-trial_GM479516143.pdfIn PDF document text
    • http://www.dhs.or.id/new/public/ckfinder/userfiles/files/is-roblox-free-on-ps4_GM431946152.pdfIn PDF document text
    • http://dhs.or.id/new/public/ckfinder/userfiles/files/minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • http://dhs.or.id/new/public/ckfinder/userfiles/files/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • http://dhs.or.id/new/public/ckfinder/userfiles/files/android-coin-master-3433-apk-hack_GM406889139.pdfIn PDF document text
    • http://dhs.or.id/new/public/ckfinder/userfiles/files/free-robux-hack-no-human-verification-or-survey_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_004_off0000501e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x501E 25544 bytes
SHA-256: b7a14a4918c246b35ba3131940553993abcb7da3762a3c8112974ff9d1f1b200
font_01_sfnt_off00008b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B17 19224 bytes
SHA-256: b4534d771c4cb34b840c142fba640750969bbad29e0a340756c1f913fdd021b3

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