Malicious PDF — malware analysis report

Static analysis result for SHA-256 235b77e00eb5f995…

MALICIOUS

PDF

34.1 KB Created: 2021-07-05 23:44:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 2fd822aecccf4c6d9cb261e9e15a8e40 SHA-1: 9a75234f9ed6e00da3b18c60fe31c1e9a5988665 SHA-256: 235b77e00eb5f995cd89a190fabfdd44f0ff417f30d15742f05e04c9aa4ff424
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external websites, many of which are identified as malicious redirectors or part of a link farm. The document body and heuristic firings indicate a lure for game-related cheats or currency, specifically mentioning 'Roblox Robux' and 'game hack'. The primary malicious URL identified is http://netcdn.tw/app/431946152/roblox-robux-game-hack, which is likely used to deliver a secondary payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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.
  • 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-robux-game-hack In PDF document text
    • http://library.atim.ac.id/repository/giving-away-free-robux-cards-live_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/coin-master-rare-cards-hack_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-coin-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/xray-mod-minecraft-114_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-moderators_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-ultimate-driving-westover-islands-money-hack_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/now-roblox-logo-gives-free-robux-robuxmaniac_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/top-5-ways-to-get-free-robux-nicsterv_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/hacking-roblox-accounts-sites_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/cheat-codes-roblox-mad-city-money_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-roblox-hack-no-survey-or-download_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/easy-hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-get-minecraft-for-free-on-tablet_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/instant-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/coinmaster-com_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-restaurant-tycoon-hacks_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-robux-apk_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/hey-google-how-to-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_off00002eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EB1 22692 bytes
SHA-256: 8d65952c591f62ca6ec4fc721d5055f79533368e580a1d4c97945c7faac40467
font_01_sfnt_off0000617d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x617D 18628 bytes
SHA-256: 91fe40ca7b1c63e097b3ed98f551f0053b3fa477182f2dddb1f8374deacdf7be

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