Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ece3a2836cb0256…

MALICIOUS

PDF

48.1 KB Created: 2021-06-10 23:20:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 3fd96e3996279c8e4158bbc2c72941c4 SHA-1: ac6dbda142237f9759beae963b65254ec148a2d2 SHA-256: 4ece3a2836cb0256e6a6287a33a8483774e17dc497a9714ffbac2b6469448f2f
268 Risk Score

Malware Insights

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

This PDF document employs social engineering tactics, presenting a fake CAPTCHA and urgency lures to trick users into clicking embedded links. These links, such as the one pointing to 'roblox-jailbreak-nclip-hack-2021-may-game-hack', lead to malicious redirectors and a large number of other PDFs, indicating a link farm designed for SEO manipulation and potentially malware distribution. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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-jailbreak-nclip-hack-2021-may-game-hack In PDF document text
    • https://library.fdk.ac.id/repository/coin-master-400-spin-link-hack_GM406889139.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/old-roblox-accounts-for-free_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/how-do-you-grt-free-robux_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/how-to-hack-target-roblox_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/free-roblox-card-codes-not-used-2021_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/free-stuff-in-catalog-roblox_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/fb-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/minecraft-pocket-apk_GM479516143.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/coin-master-free-spins-deutsch-download-ios-link_GM406889139.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/i-want-free-robux_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/how-to-get-minecraft-bedrock-edition-for-free_GM479516143.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/coin-master-hackcom-xyz_GM406889139.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_off000052e6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52E6 25376 bytes
SHA-256: 646d35c5cf9972714a7f300d60c9a0020d4bd59935f5011e6f87b257a409f8be
font_01_sfnt_off00008c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C21 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off000095cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95CF 19424 bytes
SHA-256: 7df790ccb4006fd66500826ef4c1a0e7c51f056864596ab73b8b60420262a022

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