Malicious PDF — malware analysis report

Static analysis result for SHA-256 e406834a3ca9f4c0…

MALICIOUS

PDF

52.7 KB Created: 2021-05-11 12:43:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b690ffd68bfac3f9ee7ee1f6a09e5b56 SHA-1: a145a76b59908b8ab4e66f4e7c88165cb150c029 SHA-256: e406834a3ca9f4c097f87d2ac86ce0987130509dae6caf5be128595a6e10337c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to malicious redirectors disguised as game hacks or generators, such as 'how-to-get-roebucks-in-roblox-game-hack'. The document body, though partially corrupted, also contains references to these lures and embedded URLs. The presence of a visual download button further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9366

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.xyz/app/431946152/how-to-get-roebucks-in-roblox-game-hack In PDF document text
    • https://mbbs.hr/files/fast-robux-online_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/simplysarc_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-website_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-hack-online_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/500-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/robux-free-com_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/minecraft-free-download-windows-10_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-free-spins-link-no-verification-code_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-daily-gift-free-spins-and-coins-link-today_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/robux-gratis_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-picture_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/robux-converter_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/roblox-booga-booga-hack_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-spins-for-coin-masters_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/free-spins-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/roblox-games-to-play-for-free_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004afe.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AFE 24832 bytes
SHA-256: 3db8c45100ace335c1adef55e7891ec6fa94fccf95adcae1c4bd9a5944aec436
font_01_sfnt_off000083ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83EA 12800 bytes
SHA-256: db399d969d9309c9c38cb6e3c43aa83c06d227a5470715de93176d1df1e6747d
font_02_sfnt_off0000abc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABC7 18364 bytes
SHA-256: ef1b78a66279658933fe2b8668a06e9e8330ca7c94d89169a06b9c8d822bf7c7

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