Malicious PDF — malware analysis report

Static analysis result for SHA-256 41228aacddcf1762…

MALICIOUS

PDF

229.4 KB Created: 2021-07-05 07:54:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1dafbf36dccdca9065585ad1103b9ac5 SHA-1: 33ae6246f98e87f4b9d386438489d7db52a8de0a SHA-256: 41228aacddcf17626c0b8eeaf24da8d9c299dab90284990e3589a28c65f1f213
250 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains multiple heuristics indicating social engineering lures, including a fake CAPTCHA, a download button, and a browser extension installation prompt. It links to a known malicious redirector, http://netcdn.tw/app/1094591345/download-pokemon-go-free-game-hack, which is likely serving a malicious payload. The document's content and heuristics suggest an attempt to trick the user into downloading and executing further malware.

Machine Learning

  • Nyx PDF Classifier clean score 0.0101

Heuristics 7

  • 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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/1094591345/download-pokemon-go-free-game-hack In PDF document text
    • http://library-fkip.uho.ac.id/repository/free-unlimited-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/block-hunt-hacks-roblox-pastebin_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/roblox-making-hacker-smilator_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/robux-20210-free_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-roblox-cards-pin-number_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/fan-page-coin-master_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/bug-free-uniform-of-roblox_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/roblox-arsenal-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/how-to-get-free-robux-in-roblox-no-hacks_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/coin-master-free-spins-links-2021_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/build-battle-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-hat-roblox-codes_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/how-to-get-free-robux-no-scam_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_024_off00032871.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32871 25728 bytes
SHA-256: 1952bda4bea085741e278c4da1011bbc90d3705928acd9d8d798c33fdc5456ef
font_01_sfnt_off0003649c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3649C 18940 bytes
SHA-256: 5a820c30d5f45f2093bde67929426e8d3dedc3b1bb17b56129f6964fd25b0b44

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