Malicious PDF — malware analysis report

Static analysis result for SHA-256 391c0f60a105e118…

MALICIOUS

PDF

33.0 KB Created: 2021-07-04 01:57:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d51d810b176b7ed8917945c6fd741cfa SHA-1: e2b6ef257cd6d103be13077d5714f0319c85c5d6 SHA-256: 391c0f60a105e118bbf6817c0708b70373155eb8d5c13a2e1fc596d993959bf0
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, including a direct link to a known malicious redirector infrastructure. The document body explicitly mentions 'Roblox Free Robux' and 'game hack', indicating a lure for potentially malicious downloads or phishing. The presence of a raw IP address in a URL further supports malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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.
  • 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.tw/app/431946152/roblox-free-robux-game-hack In PDF document text
    • http://202.56.165.220/digilab/repository/are-there-and-free-safe-roblox-exploits-v3rmillion_GM431946152.pdfPDF link annotation
    • http://202.56.165.220/digilab/repository/how-to-fly-in-roblox-without-hacks_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/free-wing-roblox-2021_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/roblox-hacks-for-arsenal_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/free-modded-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/roblox-free-online-no-signing-up-or-nothing_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/roblox-site-hack_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/infinite-jump-hack-for-roblox_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/coin-master-spin-blogspot_GM406889139.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/how-to-get-free-hats-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/minecraft-hacks-wurst_GM479516143.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/chat-hack-10-roblox_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/can-you-get-banned-on-roblox-for-hacking_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/roblox-robux-hack-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/blox-rewards_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/freespinandcoinblogspot-com-2021-11-coinmasterfreespins_GM406889139.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/coin-master-hack-version-download-ios_GM406889139.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/how-to-get-free-robux-easy-on-android-without-downloading_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
font_00_sfnt_off00002b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B40 22424 bytes
SHA-256: 4958eff9e30a07d69e1d7c932b3a4e85c2b37ff67503d1c884e929cb6c376294
font_01_sfnt_off00005ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CE6 18788 bytes
SHA-256: 240f26960413d3375b32b54d3a16c3eb3bd7324ec8649811f17e0fe1da2802cb

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