Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc021b0dd88b746d…

MALICIOUS

PDF

44.7 KB Created: 2021-06-11 02:56:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a2b5fbf9616758538e7afc5842b36906 SHA-1: c0173b1a104bab8cdb2adf2755e81166f1449e0b SHA-256: fc021b0dd88b746d2ddf2385490969a47419962d2729c7bbac7e5e41a91b3fa7
200 Risk Score

Malware Insights

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

This PDF document contains multiple links to known malicious redirectors and game hack lures, specifically targeting 'free Robux' generators. The presence of a fake CAPTCHA heuristic suggests an attempt to trick the user into interacting with these links, likely leading to further malicious content or downloads. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/keyword-free-robux-game-hack In PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-meme-gui-free_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/wwwcoin-master-hack-game-download_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-hack-apk-ios_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/cookie-hack-roblox-players-on-galaxy-note-8_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/youtube-roblox-hack-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/trrbx-site-free-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-robux-generator-http-freerobuxgenerator-xyz_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/hacks-for-roblox-apps_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-free-rare-cards_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/2021-robux-free-host_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-500-robux-quiz_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-get-free-admin-in-roblox_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/robux-prices_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-spins-on-coin-master-app_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/rewards-robux_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_off000050a4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50A4 25360 bytes
SHA-256: 3a46d57c6dd3fc787c538d487e7a3903f31d19560cbeb66400f2c883fd0850ec
font_01_sfnt_off00008b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B49 18532 bytes
SHA-256: c6b6016cc59dcb45405b8e5db890beb8270611d22f4427f46e7b4254bf82e606

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