Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdefafd767ec1192…

MALICIOUS

PDF

47.1 KB Created: 2021-06-08 13:29:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 9afffcf9b6e0bae4f4fd71b1dbc70114 SHA-1: 7c8e0dc61f1947211cf100dd3922c9fb6d17bbba SHA-256: fdefafd767ec1192b2375b02d2484e2e207fbed33c08582532ccc521ba575815
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links that redirect to malicious infrastructure, disguised as game hacks and free generators. The presence of a fake CAPTCHA heuristic suggests an attempt to trick the user into executing further actions. While no scripts were explicitly extracted, the nature of the redirects and the lure indicate a likely intent to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/roblox-bloxburg-free-access-game-hack In PDF document text
    • http://heilzentrum-ulm.de/images/easy-roblox-hacks-not-malware_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/tiktok-free-followers-hack_GM835599320.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/daily-free-spins_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-images_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-money-cheat-codes_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-minecraft-svg-cutting-files_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/hack-xp-net-generators-coin-master_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-no-human-verification-survey-or-download_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-for-free-no-human-verification_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-hack-app-android-download_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-tiktok-accounts_GM835599320.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/hack-my-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/pokemon-go-free-items_GM1094591345.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_off00004e08.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E08 25836 bytes
SHA-256: 90187c060514052490537ab402ec34bfaf145a2722a33f2038e932cdc9e7bfc6
font_01_sfnt_off00008adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ADC 2908 bytes
SHA-256: e28d2c57f35643e2026f86c34ac3bb63cba74be3f6c066e81aba6d285e5a121b
font_02_sfnt_off000094d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94D6 18376 bytes
SHA-256: 2f9eab03ab7bb8725c06efdc5186bf32ff37e9e99598bae17cca7e06ed794466

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