Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d0191bf1403fae…

MALICIOUS

PDF

37.4 KB Created: 2021-05-16 00:42:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 527104a5ad66430d92a9de060ff8f401 SHA-1: 47d4c48e02180083349521b3a9ad5d5cc3e56ad7 SHA-256: f1d0191bf1403faefc8e4f9b0e0b83047a83ee74a6cfead38374b9c83329f66c
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a malicious redirector link disguised as a 'free generator / game hack' lure, which is a common tactic for phishing or malware distribution. The document body explicitly contains the text 'How Do U Get Free Robux' and a call to action 'CLICK HERE TO ACCESS ROBLOX GENERATOR', further reinforcing the deceptive nature of the content. The presence of embedded URLs and the heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

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-do-u-get-free-robux-game-hack In 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_003_off000034eb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34EB 25964 bytes
SHA-256: 9807123b1bf3c9fd9d037abb46bb53e4ba65160afbdb6cafe39f8630d733ff32
font_01_sfnt_off00006fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FCA 18636 bytes
SHA-256: ab6f51fdb1eed883fd21dff3bd0336e3a1b816e6c21a8924207bfe84ed9a007e

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