Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3f54c2b0291a54…

MALICIOUS

PDF

45.3 KB Created: 2021-06-03 07:24:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 3882318d00e03635fe511eeb019b9a0e SHA-1: a2ba7298462f30c60516761819a2607387dae956 SHA-256: cb3f54c2b0291a548b613b09809ee759f6819e729d25c8deb1275bef928b3e15
220 Risk Score

Malware Insights

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

This PDF document employs a lure of game hacks and free currency to trick users into clicking malicious links. The embedded links lead to a redirector and a farm of other PDF documents, suggesting a multi-stage lure campaign. The primary malicious URL identified is https://netcdn.online/app/431946152/roblox-hack-scripts-pastebin-game-hack, which is part of a known malicious redirector infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.online/app/431946152/roblox-hack-scripts-pastebin-game-hack In PDF document text
    • http://slim.sisminkada.net/repository/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/mcpe-free-download_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-hack-coin-master-using-es-file_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/boost9-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/hack-robux_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/hack-my-game-xyz-coin-master_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-free-spins-and-coins-group_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/roblox-fun-robux_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-generate-free-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-spins-coin-master-march-2021_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-free-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/master-8-ball-pool-free-coins_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/pokemon-go-for-free-download_GM1094591345.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-spin-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-minecraft-skins-girl_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-hack-peoples-roblox-accounts_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_004_off00005316.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5316 25244 bytes
SHA-256: 6089321203d4c4a17a010d3a05635305c64838e017e8a532afdf91654d70b48d
font_01_sfnt_off00008d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D06 18736 bytes
SHA-256: ab18ebd86474bf723d827c8d503b9efdd759369ebb4bbf8c3e0b4762acc2a078

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