Malicious PDF — malware analysis report

Static analysis result for SHA-256 f75a898a259d8a81…

MALICIOUS

PDF

36.7 KB Created: 2021-05-14 01:03:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 869807520d80d23cb15435435102ac68 SHA-1: 5e26516a3dc80a3f6caf3506b0ba0a37ea52f44c SHA-256: f75a898a259d8a81d2d9db3dee5993dc23f0fbbde821ccdb7f9074f10bc2639c
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a lure for a 'free generator / game hack' which redirects to a known malicious URL. This indicates a phishing attempt designed to trick users into visiting malicious infrastructure, likely to download further malware or engage in credential harvesting. The PDF structure and embedded URL strongly suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier clean score 0.0312

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_off000031de.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31DE 24872 bytes
SHA-256: 1106ab0b418fe2e581451c568018d8bda1fc5633ea1c6f61423f23533bd26e15
font_01_sfnt_off00006b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B40 19092 bytes
SHA-256: cc4041fc50bd2ea9a1268967e32916156e3a634973a216864dd7f220ceb04504

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