Malicious PDF — malware analysis report

Static analysis result for SHA-256 c48659f5f21b88fe…

MALICIOUS

PDF

44.0 KB Created: 2021-06-11 05:59:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ab259a5787b267e0d8052b159d0c528c SHA-1: de4a5b007e5d4aa1025ddcb43f1b0317c1aa6fa3 SHA-256: c48659f5f21b88fea16041f1603c279a1a83a139d6e5908538332e9f7149335b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and lures users with promises of game hacks and virtual currency. The primary link, https://netcdn.tw/app/431946152/how-to-cheat-in-roblox-to-get-robux-game-hack, is identified as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest a social engineering attack designed to drive users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/how-to-cheat-in-roblox-to-get-robux-game-hack In PDF document text
    • http://ines.co.rs/images/free-printable-roblox-images_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/coin-master-ad_GM406889139.pdfIn PDF document text
    • http://ines.co.rs/images/minecraft-114-4-download_GM479516143.pdfIn PDF document text
    • http://ines.co.rs/images/roblox-free-robux-2021-august_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/roblox-fun-robux_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/was-minecraft-ever-free_GM479516143.pdfIn PDF document text
    • http://ines.co.rs/images/roblox-character-free_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/roblox-redeem-card-codes-free_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/minecraft-build-hacks_GM479516143.pdfIn PDF document text
    • http://ines.co.rs/images/roblox-free-login_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/can-i-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/how-to-hack-roblox-to-get-emitted-roblox_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/optifine-mcpe_GM479516143.pdfIn PDF document text
    • http://ines.co.rs/images/is-roblox-free-on-nintendo-switch_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/roblox-cheat-engine-game-shutdown_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/get-free-robux-now_GM431946152.pdfIn PDF document text
    • https://rblx.landIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f8c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F8C 24668 bytes
SHA-256: d85914a7e228c7e474c6e637f5d36f96b0bb042dccb2088670401aa51bf9ddcb
font_01_sfnt_off00008866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8866 18584 bytes
SHA-256: 434a8c405c008cdcd1d4f82916bbb3ef6cfcb90c34fd02ee188f682f2d088e54

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