Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e650185dafbbee…

MALICIOUS

PDF

43.6 KB Created: 2021-05-16 00:32:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 2fe0e4ceb8e3406c8f6d2618ee085b0a SHA-1: 26fc7f03365d3d6981cb06e4110d9ce104d34b85 SHA-256: a4e650185dafbbee30befdf23b525b9700f176f0f937978e6bcf33c9644a1ca7
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains multiple links to malicious redirectors, masquerading as game hacks and generators. It employs a fake CAPTCHA lure to trick users into interacting with these links, likely leading to further malicious content or exploitation. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.xyz/app/431946152/how-to-hack-roblox-accounts-passwords-game-hack In PDF document text
    • http://fia.ub.ac.id/katalog/repository/how-to-change-your-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/coin-master-free-spins-link-2021-ios_GM406889139.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/free-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/what-is-robux-in-roblox_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/free-robux-link_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/roblox-games-com-free_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/httpswwwurcouponsdealcom202103coinmasterfreespinandcoinlinkshtml_GM406889139.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/robux-hack-tools_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/dailyrobux_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/coin-master-spins-hack-2021_GM406889139.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/optifine-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/free-spins-coin-master-2021-no-verification_GM406889139.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/free-spin-coin-master-today_GM406889139.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_003_off00004851.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4851 27212 bytes
SHA-256: 05dce421c48d3f4cfc093e5ab8f137540ff1ba114734f6bc0a5f13e0d6dcd0d0
font_01_sfnt_off00008623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8623 18916 bytes
SHA-256: 1a35cdd5966ddf5a07fa4c0cf1a4b7623ebf18d314e768fc1998c6779142cc7b

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