Malicious PDF — malware analysis report

Static analysis result for SHA-256 4971bdd50f1c6505…

MALICIOUS

PDF

35.0 KB Created: 2021-06-27 12:19:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 5d2d11c59c58ee007905eac7be6245ab SHA-1: 0fd053b21dc2fd0446ddb3333483f060df96bb9e SHA-256: 4971bdd50f1c6505458d93d379b4a8ca7e55f88a47652ef27b58e4381608305a
260 Risk Score

Malware Insights

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

This PDF document employs social engineering tactics by presenting itself as a 'free generator' or 'game hack' for popular games like Roblox. It contains numerous links, including one pointing to a known malicious redirector infrastructure at http://netcdn.co/app/431946152/free-auto-clicker-for-roblox-mac-game-hack. The document body and embedded links suggest a lure to download unwanted software or visit scam websites, aligning with a phishing or potentially a malware distribution attack pattern. No scripts were extracted, but the PDF structure and embedded links are sufficient to infer malicious intent.

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.
  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/free-auto-clicker-for-roblox-mac-game-hack In PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-fun-com-robux_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-get-free-rolls-on-roblox-elemental-wars_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-change-robux-pastebin-hack-2021_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-hack-cheat-engine_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-spins-for-coin-masters_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/como-vestirse-hackear-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/body-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-royale-high-dimond-hack_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-coin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/previous-next-free-roblox-pokemon-go-6-new-by-heavenloginplay_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-robux-accounts-2021_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-viking-quest-hack_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-cheat-money-in-roblox-high-school_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/hack-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-look-good-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/can-i-get-free-robux_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_off000031db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31DB 22244 bytes
SHA-256: ba0c5a5124dfb3b28a49aa0443d37bc668566941b0a12e889fc8326dda98c8f8
font_01_sfnt_off00006313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6313 19380 bytes
SHA-256: f8a493e81dfd50ba4c30e2df8835e95ddd0eab2ec1118c596ec398e745d92b21

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