Malicious PDF — malware analysis report

Static analysis result for SHA-256 8221dfad9f8feb51…

MALICIOUS

PDF

37.7 KB Created: 2021-05-13 19:00:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b2ebc2b17218730fdc6515d8f5aff96d SHA-1: 8a32a09d2adc126349970d27abfbd54b4990ff48 SHA-256: 8221dfad9f8feb51bf1ac76d8d1775c430d20b1ceaf10d5bc17bbd60dc010084
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for a malicious redirector link, specifically targeting users with a lure for free game currency ('Robux'). The embedded URL, https://netcdn.xyz/app/431946152/how-to-get-free-robux-2021-easy-game-hack, is associated with known malicious infrastructure. While no scripts were explicitly extracted, the PDF structure and the nature of the lure suggest an attempt to redirect users to a potentially harmful site, likely for further exploitation or credential harvesting.

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-to-get-free-robux-2021-easy-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_off00003537.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3537 26188 bytes
SHA-256: c99a95327d876d87d15e41a5e2e77153c426a1cb0f8719aee292741563e757df
font_01_sfnt_off00006f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F77 19092 bytes
SHA-256: cc4041fc50bd2ea9a1268967e32916156e3a634973a216864dd7f220ceb04504

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