Malicious PDF — malware analysis report

Static analysis result for SHA-256 1821d83d9c0b5cee…

MALICIOUS

PDF

38.5 KB Created: 2021-05-10 17:40:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 24e8a010a6682dbfa6d0a983019aac7c SHA-1: 5d3e3da821276ff60bca0181a1a8fa08683c6cc6 SHA-256: 1821d83d9c0b5ceeea4006c04945a6f5c768030402bd4aa895c85ec07a21a58b
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for a game hack generator, which redirects to a known malicious URL. This suggests a phishing or scam attempt designed to trick users into visiting a compromised site. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

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/earn-roblox-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_off000032c5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32C5 31272 bytes
SHA-256: 406cfda1b578bd311a6fc23557abc458a4247bd1ecb027754a8399af578acff4
font_01_sfnt_off0000760b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x760B 18012 bytes
SHA-256: 93bf5a204a867a3cc71fe61d8ba690d7c5ca8a3d58d56ec60b4692a28d6ed968

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