Malicious PDF — malware analysis report

Static analysis result for SHA-256 46a5217d2ce859d6…

MALICIOUS

PDF

34.3 KB Created: 2021-07-05 04:33:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1c710b5163a7402fcdcdcc00d0e14936 SHA-1: 3d63e23f6f1d620761da2b61324efc71c3c8e6be SHA-256: 46a5217d2ce859d6da81b7317c0f52416d871c37ac8d58f3b62763a4cab0469d
240 Risk Score

Malware Insights

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

This PDF document employs a lure for 'free Robux' and presents a fake CAPTCHA to trick users into interacting with malicious links. The document contains multiple embedded URLs, including a known malicious redirector, which likely serve to download and execute further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the observed social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/431946152/free-robux-hack-no-human-verification-game-hack In PDF document text
    • http://library-fkip.uho.ac.id/repository/game-give-free-robux_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/minecraft-for-macbook-free_GM479516143.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/best-free-spins-link-coin-master_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/by-pubg-uc_GM1330123889.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/how-to-hack-after-the-flash-roblox_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-roblox-usernames-and-passwords_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-robux-without-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/robux-cheat-no-survey_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/instant-robux_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/roblox-hacks-client_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/hack-coin-master-2021-pc_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/coin-master-game-free-spin_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/chisel-and-bits-mod-pe_GM479516143.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
font_00_sfnt_off000030b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30B9 21556 bytes
SHA-256: 26204fa1852def0330dc09b42e73bd52c6e54488347c352bb2f8d0612f078177
font_01_sfnt_off00005fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE2 19504 bytes
SHA-256: eb8ce7e3da5a97c3b4f0a1013d81a421e960dbc6320d0a210e145d8bed029be0

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