Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb24950e2a91c769…

MALICIOUS

PDF

46.4 KB Created: 2021-06-09 06:51:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9e75140ce2720df6c01fff3f22ba32a7 SHA-1: fa77f544efe8eccde462794c509ae13ba67c3855 SHA-256: cb24950e2a91c7695a54a2c95c9af2f5b6fc67cd9cbb5527808f7db7cf7d5b84
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for 'free Robux' and game hacks, directing users to a suspicious URL. This heuristic, combined with the ML classifier flagging the PDF as malicious, strongly suggests a phishing or scam attempt. The embedded URL is likely the primary mechanism for delivering a secondary payload or redirecting the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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 https://netcdn.tw/app/431946152/get-free-robux-by-downloading-games-game-hack In PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-apk-hack_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/minecraft-build-hacks_GM479516143.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/roblox-arsenal-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-free-spin-redeem-code_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/is-tiktok-free_GM835599320.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/roblox-catalog-free_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/ios-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/minecraft-pe-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/smart-lodhi-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/robux-hack-download_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/what-do-points-do-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/hacker-coin-master_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-spins-and-coins-coin-master_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
stream_004_off000053d1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53D1 25856 bytes
SHA-256: 030a1cdaed56dfb91ff1e3756644c02f8d0198cc37ad45f081894dde63826e45
font_01_sfnt_off00008e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E53 19772 bytes
SHA-256: 6b00ef08b726904018bda9cbe2bc2bc0487c357f97e65c103d5e00951d7a7fcf

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