Malicious PDF — malware analysis report

Static analysis result for SHA-256 d54b1b6d639cbd44…

MALICIOUS

PDF

34.5 KB Created: 2021-07-19 20:54:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ba1cb9b63d903ecfbc5c84ce3553218b SHA-1: 7f5b3eedd2731de00dcb75c53007666b2113656a SHA-256: d54b1b6d639cbd44d1988a139887179125bc093120afc8259b0f46be848aa7eb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to malicious redirectors and scam-related content, specifically targeting users seeking free Robux or game hacks. The heuristic firings indicate that the PDF is designed to redirect users to potentially harmful websites. While no scripts were directly extracted, the embedded URLs and the nature of the lures strongly suggest a phishing or scamming attempt, likely to deliver a second-stage payload or collect user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.tw/app/431946152/how-to-get-free-robux-without-verifying-game-hack In PDF document text
    • https://www.zagi.hr/files/roblox-hack-me_GM431946152.pdfIn PDF document text
    • https://www.zagi.hr/files/free-tiktok-comments_GM835599320.pdfIn PDF document text
    • https://www.zagi.hr/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://zagi.hr/files/how-do-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://zagi.hr/files/how-to-get-minecraft-for-free-on-ipad_GM479516143.pdfIn PDF document text
    • http://zagi.hr/files/free-robux-generator_GM431946152.pdfIn PDF document text
    • http://zagi.hr/files/minecraft-hack-download_GM479516143.pdfIn PDF document text
    • https://www.zagi.hr/files/how-to-get-free-likes-on-tiktok_GM835599320.pdfIn PDF document text
    • http://zagi.hr/files/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://zagi.hr/files/is-minecraft-dungeons-free_GM479516143.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_off00002c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C31 23352 bytes
SHA-256: 705b94089acf3496b4709a0fa2830663cbdf4994349e902f36dcf2f4c51b0f66
font_01_sfnt_off0000613d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x613D 19556 bytes
SHA-256: 3180b827c1ac204ed09c62f28e5521153ec6c9c19d09c72764a39a757af798e0