Malicious PDF — malware analysis report

Static analysis result for SHA-256 a991143a4cfd9c33…

MALICIOUS

PDF

35.1 KB Created: 2021-06-27 08:19:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 39803a50608601e2644d0bb917ff8384 SHA-1: d6fd92a98b6ea7a52f353e7536a5bad13dee17b9 SHA-256: a991143a4cfd9c33c93ebc7c0671bcf42a75583ae51d7f8e337f574a3b3ee858
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, including one identified as a malicious redirector leading to a 'game hack' lure. The document body and extracted URLs reinforce the theme of exploiting user interest in free game-related items, such as Robux for Roblox. The presence of these links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites.

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/counter-blox-roblox-offensive-case-hack-game-hack In PDF document text
    • https://elearning.man4banjar.com/__statics/gudangsoal/files/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • https://elearning.man4banjar.com/__statics/gudangsoal/files/free-roblox-jump-exploiut_GM431946152.pdfIn PDF document text
    • https://elearning.man4banjar.com/__statics/gudangsoal/files/roblox-hack-robux-pastebin_GM431946152.pdfIn PDF document text
    • https://elearning.man4banjar.com/__statics/gudangsoal/files/roblox-dino-sim-duplicate-hacks_GM431946152.pdfIn PDF document text
    • https://elearning.man4banjar.com/__statics/gudangsoal/files/free-roblox-accounts-with-obc-2021-discord_GM431946152.pdfIn PDF document text
    • https://elearning.man4banjar.com/__statics/gudangsoal/files/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • https://elearning.man4banjar.com/__statics/gudangsoal/files/roblox-free-model-prolem_GM431946152.pdfIn PDF document text
    • https://elearning.man4banjar.com/__statics/gudangsoal/files/free-robux-farm_GM431946152.pdfIn PDF document text
    • https://elearning.man4banjar.com/__statics/gudangsoal/files/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://elearning.man4banjar.com/__statics/gudangsoal/files/free-rixty-codes-for-roblox-2021_GM431946152.pdfIn PDF document text
    • https://elearning.man4banjar.com/__statics/gudangsoal/files/how-to-make-free-shirts-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.man4banjar.com/__statics/gudangsoal/files/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.man4banjar.com/__statics/gudangsoal/files/how-to-hack-murder-mystery-2-on-roblox-with-nopdengine_GM431946152.pdfIn PDF document text
    • https://elearning.man4banjar.com/__statics/gudangsoal/files/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • https://elearning.man4banjar.com/__statics/gudangsoal/files/roblox-follow-bot-free_GM431946152.pdfIn PDF document text
    • https://elearning.man4banjar.com/__statics/gudangsoal/files/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.man4banjar.com/__statics/gudangsoal/files/roblox-dragon-ball-rage-hack-2021_GM431946152.pdfIn PDF document text
    • https://elearning.man4banjar.com/__statics/gudangsoal/files/robux-hack-ios-no-verification_GM431946152.pdfIn PDF document text
    • https://elearning.man4banjar.com/__statics/gudangsoal/files/hacker-texting-simulator-simulator-roblox-code_GM431946152.pdfIn PDF document text
    • https://elearning.man4banjar.com/__statics/gudangsoal/files/roblox-game-pass-hack-2021_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
font_00_sfnt_off0000315f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x315F 22644 bytes
SHA-256: cfa3109e54447763e1aa2ba0437046365537ebf9a2990a9d7837804b0e133691
font_01_sfnt_off000063bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63BD 19136 bytes
SHA-256: c38499a772dd31bc05510778ece4a1dc190a1a1d59f39e19c3f32418483c3bdd

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