Malicious PDF — malware analysis report

Static analysis result for SHA-256 381de08727b3f1c8…

MALICIOUS

PDF

42.7 KB Created: 2021-06-14 01:59:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ffc544b069a003d95bc5925f747ba033 SHA-1: d70c989e5221ef5aa6a1d62382ccd2f3ba7ddcc1 SHA-256: 381de08727b3f1c83cb126a583126113ec6456bec65af3c4e70b3597091382df
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external resources, including a known malicious redirector and an IP address hosting further PDF files. The presence of a fake CAPTCHA heuristic indicates the document is designed to trick users into performing an action, likely to download or execute a second-stage payload. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.co/app/431946152/roblox-free-online-without-downloading-game-hack In PDF document text
    • http://202.56.165.220/digilab/repository/free-robux-working_GM431946152.pdfPDF link annotation
    • http://202.56.165.220/digilab/repository/how-to-get-free-cloth-roblox_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/how-do-you-get-free-roebucks_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/roblox-moderators_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/how-to-be-carrot-god-for-free-in-roblox_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/coin-master-coins_GM406889139.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/coin-master-code-for-free-spins_GM406889139.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/how-to-get-free-coins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/download-hacked-games-com-coin-master_GM406889139.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/free-roblox-stuffcom_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/microsoft-rewards-robux_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/doctor-louie-roblox_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/free-minecraft-hosting-24-7_GM479516143.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/minecraft-tower-defense-hacked_GM479516143.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/2021-free-robux-glitch-in-febuary_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/coin-master-100-spin_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
font_00_sfnt_off00004961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4961 23812 bytes
SHA-256: 683767b2742a9e3f6297618f5bc3327a5d5ec95374a2eab17c5e478e0b10c7e5
font_01_sfnt_off00007f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F8F 19884 bytes
SHA-256: 878d935cbc9ceafb7ee911b51d4b05787017ea205bade3c36eca676f0d543d78

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