Malicious PDF — malware analysis report

Static analysis result for SHA-256 641771f973d53777…

MALICIOUS

PDF

45.4 KB Created: 2021-06-09 01:50:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b9c5ee993e261fe07df10a0cd25c20ba SHA-1: b162b9d38758c8ea014ebed976f96701fd4377cf SHA-256: 641771f973d53777eef5d0bd2ae71d0c305be1db8885bce8fb5a46c43d42b1c7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with promises of game hacks. The embedded content, though obfuscated, suggests a redirection workflow. The primary goal appears to be directing users to potentially malicious websites for further exploitation or scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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-hack-grand-blox-auto-roblox-game-hack In PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/coin-blogspot_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/how-to-use-redstone_GM479516143.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/robux-scam_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/how-to-get-free-skins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/how-to-hack-coin-master-cheat-engine_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/coin-master-free-spin-and-coins-fbid-links_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/free-roblox-avatar-ideas_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/minecraft-pe-free-download-android_GM479516143.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/minecraft-dungeons-download-free_GM479516143.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/free-robux-redeem-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/toolbox-for-minecraft_GM479516143.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/minecraft-menu_GM479516143.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/coin-master-hack-mod_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_off00005068.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5068 26648 bytes
SHA-256: 6e799e6cb4ea61588a9eac234088d1074ca3786d608f00597dd0b7009d8361fe
font_01_sfnt_off00008d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D5E 18764 bytes
SHA-256: 7895bd21fa728f1a703c66c096932bf9957a1cc38d53e31eeeadca6a3f4d5a4d

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