Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a4f8677f866366…

MALICIOUS

PDF

43.2 KB Created: 2021-05-22 16:17:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0858972db10a3cf0f521071a7907db3b SHA-1: aad4a03ffc7d73dfe74e89708917cad5c02e2f3c SHA-256: 25a4f8677f866366fcc79a1cc63b60346aca2bd6813d2dba3fd80b99e622a1f1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs that redirect to known malicious infrastructure, specifically promoting 'free Robux' or 'game hacks'. The document body, though partially corrupted, also contains references to these lures and a malicious URL. The presence of these links and the ML classifier's flagging strongly indicate a phishing or scam attempt designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7429

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/websites-to-get-free-robux-game-hack In PDF document text
    • https://www.solucionesdigit.com/images/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.solucionesdigit.com/images/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.solucionesdigit.com/images/how-to-give-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://www.solucionesdigit.com/images/minecraft-free-app_GM479516143.pdfIn PDF document text
    • https://www.solucionesdigit.com/images/coin-master-free-spin-daily-link_GM406889139.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_002_off000034c3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34C3 30176 bytes
SHA-256: cdf9ddff0c137cb25876e7beabeadd86af190a1be838cbf25cbe0c27e4d6afd1
font_01_sfnt_off00007a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A57 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off000086ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86FF 18436 bytes
SHA-256: 6ab9ab31980840835fbaeca164a74f0e8188db39a6ce5c5e4face3e95ba0b523

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