Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d30de55311673bc…

MALICIOUS

PDF

34.1 KB Created: 2021-07-05 21:40:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 97ccb21c1485ad689055e1e7a9ee357e SHA-1: f8fa75ddd840be98ed61b4ee970ccab5c470ecc6 SHA-256: 4d30de55311673bcf019ef42266d4b7f6593732745e61ea9f6f512cfa460699d
160 Risk Score

Malware Insights

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

This PDF document employs a lure of free Robux and game hacks to trick users into clicking malicious links. The primary link directs to a known malicious redirector infrastructure, likely serving as a gateway to further malicious content or exploits. The ML classifier strongly indicated maliciousness, and the presence of multiple redirector links reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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-on-phone-game-hack In PDF document text
    • http://library.ft.upnvj.ac.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/play-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/coin-master-free-spins-usa-2021_GM406889139.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/impact-hack-roblox-download_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/roblox-hack-free-unlimited-robux-and-tickets_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/free-robux-generator_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/buxblast-com-robux_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/coin-master-free-spins-link-no-verification-code_GM406889139.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/download-hacked-games-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/twitter-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/images-of-jhon-do-hacker-roblox_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/google-roblox-games_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/kupcake-hack-roblox-64-bits_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/roblox-jailbreak-hack_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/coin-master-daily-spin-link-app_GM406889139.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/how-to-get-free-robux-on-ipad-air_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
stream_002_off00002cbc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2CBC 22956 bytes
SHA-256: 8fdebef371537bcaa53f5d9ca1d16f9c90cc8acad6632fa3e2056e073de05ecc
font_01_sfnt_off0000608e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x608E 19036 bytes
SHA-256: 3bc7039bf1a02ee44cf77d87306d68fb788e2fdb5082ebb4bdc7c743d7253944

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