Malicious PDF — malware analysis report

Static analysis result for SHA-256 c53e23e7371c8d88…

MALICIOUS

PDF

34.8 KB Created: 2021-06-29 10:43:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 20c97140a742c424d9b1fccf22374350 SHA-1: fe55d59339ca4aab82635ed67d5e018f2af0a4fa SHA-256: c53e23e7371c8d8840a56cfb2be547431e110f930640c58821b2ae06fcb5a67c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirector lure, specifically pointing to a URL designed to trick users into downloading or accessing malicious content. The document body and embedded URLs reinforce this lure by mentioning 'Roblox Hack Free Robux' and similar game-related terms. The presence of embedded URLs and the nature of the lure suggest an attempt to deliver a secondary payload or lead the user to a phishing site.

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.co/app/431946152/roblox-hack-free-robux-com-game-hack In PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/how-to-get-free-robux-no-waiting-2021_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/roblox-murder-mystery-cheat-codes_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/hack-roblox-robux-2021_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/coin-master-game-hunter_GM406889139.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/when-was-minecraft-free_GM479516143.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/coin-master-attack-hack-apk_GM406889139.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/minecraft-bedrock-edition-download-pc-free_GM479516143.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/goo-gl-wx0ofq-free-robux_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/how-to-get-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/microsoft-bing-robux_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/roblox-robux-cheat-engine-2021_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/minecraft-com-free_GM479516143.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/free-robux-gfames-that-dont-take-password_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/roblox-tokyo-ghoul-online-how-to-get-free-half-ghoul_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/free-app-roblox-play-as-a-guest_GM431946152.pdfIn 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
font_00_sfnt_off000030f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30F8 22304 bytes
SHA-256: 4f822c3fa230f2531d828e6779d4d9fca5f1abbade9fc51049a1e5eadd4a53bd
font_01_sfnt_off00006284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6284 19220 bytes
SHA-256: 34a0ac4233ac2451cfb827fbf8fbdc175a671e6e09b29aeddec88bd4f64c913f

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