Malicious PDF — malware analysis report

Static analysis result for SHA-256 e400e78fb8a65db1…

MALICIOUS

PDF

54.0 KB Created: 2021-06-10 14:42:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: f7f4fff5b636b7361e9d732ce10b63d7 SHA-1: 7515466bbf7c25da3a1a18da0ab95f7587fe5dbe SHA-256: e400e78fb8a65db158904e76b497b2e9ee3d46fe291f08829e95ed936eed3710
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors and lures users with a fake CAPTCHA and 'game hack' promises. The primary link directs to a page designed to trick users into downloading potentially malicious content. The document's structure and content strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9517

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/roblox-hack-download-unlimited-robux-game-hack In PDF document text
    • http://heilzentrum-ulm.de/images/how-to-get-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-get-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/impact-hack-roblox_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/get-5-free-robux_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/minecraft-hacks-18-9_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/minecraft-svg-free_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/descargar-hack-roblox-jailbreak-2021_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-game-legitimate-hack-without-signing-up-or-shareing_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-minecraft-skins-xbox-one_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-roblox-gift-cards-live_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/can-we-hack-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/point-prizes-free-robux_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/synapse-hack-roblox-download_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-minecraft-mods_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-download-minecraft-for-free-on-your-phone_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-online-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-booga-booga-mojo-hack_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-cheat-money-lumber-tycoon-2_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5176 27564 bytes
SHA-256: 71fd48f47f69b74d3a138bd5dd64301528f3014fec4cde33ee9f6215befa63fc
font_01_sfnt_off00008fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FD5 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off00009c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C77 6636 bytes
SHA-256: 62075f0fe13502d46afb6e55e83d440c29ef4988399537df1f86e7653ce3b744
font_03_sfnt_off0000ac84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC84 19500 bytes
SHA-256: 34e85d47c9f417b56c4eff28f2c8550211b418729c13512494a30b1454f5c63b

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