Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf25e16f0461400…

MALICIOUS

PDF

39.6 KB Created: 2021-05-11 07:06:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 151b8ab78c17925d87ece5fc3cd51b17 SHA-1: 9a692a1ff6a1daf5aaa0da7092f0d812b97c3631 SHA-256: bcf25e16f0461400c3d23fdc1b8a6e2ff5033db1fb6f6266c41bfaef2c794a45
130 Risk Score

Malware Insights

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

The PDF file contains embedded links that redirect to malicious infrastructure, specifically advertising a 'game hack' lure. The document body text and heuristic firings confirm the presence of malicious redirector links, suggesting an attempt to trick users into visiting potentially harmful websites. No scripts were extracted from this sample, limiting the analysis of its execution flow.

Machine Learning

  • Nyx PDF Classifier clean score 0.0128

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/479516143/minecraft-tower-defense-hacked-game-hack In PDF document text
    • https://freegiftcodes.euIn 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
stream_003_off0000363d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x363D 25288 bytes
SHA-256: 874e6780516f7eeffa8ca8ea307360d3a72fac3af8e2428f25d7e0d533cbc03f
font_01_sfnt_off00006f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F4D 2840 bytes
SHA-256: 787e0768241fb57660bcc9c7f726cf687277c463cdf8c586c4782ee9d03c3606
font_02_sfnt_off0000790c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x790C 18388 bytes
SHA-256: 713945c209eafdfb17d9348275aac2514e7231b3ac112b5af91dabd48964bc5b

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