Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cf850a48219f3b9…

MALICIOUS

PDF

39.2 KB Created: 2021-05-12 08:33:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: e3608af38c38ee8517b53d8be996c159 SHA-1: 8ea0b98d4257e24ee620b2a854dc1d18e9b34990 SHA-256: 2cf850a48219f3b96ddd3e41e5a6b9ca510b46253271bdb4cc195d0591fbbdea
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to the URL https://netcdn.xyz/app/431946152/free-robux-just-click-game-hack. This URL is also flagged as a known malicious redirector. The document body contains similar text and the embedded URL, reinforcing the lure to click the malicious link. The presence of embedded JavaScript, though not explicitly detailed, suggests potential for further malicious actions.

Machine Learning

  • Nyx PDF Classifier clean score 0.0127

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/free-robux-just-click-game-hack In 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
font_00_sfnt_off00003031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3031 26468 bytes
SHA-256: 0122d116ed051fdc4c6e4386901883b261bdbc09b6b63d7bfe25411ba722f023
font_01_sfnt_off00006cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CC8 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off000076b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76B3 18648 bytes
SHA-256: e1ded540cd05842e87825decc4eb8ad0d20e53c32addf12c669dcda9e984b3fb

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