Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bfc53e6d93b75dd…

MALICIOUS

PDF

36.6 KB Created: 2021-05-10 10:55:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: e8434bd0e19ddc2e6e6d326640a69a84 SHA-1: 239343bae54727e832595f9030df6216859d4bae SHA-256: 1bfc53e6d93b75dde84bfe4c0121534deb7e9e50ab977e199aa5afba4b1efd80
170 Risk Score

Malware Insights

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

The PDF document contains embedded links that redirect to a known malicious infrastructure, specifically advertising a 'Minecraft Free Download Mobile Game Hack'. The document also employs social engineering tactics, instructing the user to press Win+R or paste a command, consistent with ClickFix attacks designed to bypass macro restrictions. The primary intent appears to be tricking the user into visiting a malicious URL that likely serves a second-stage payload.

Machine Learning

  • Nyx PDF Classifier clean score 0.0312

Heuristics 5

  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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-free-download-mobile-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_off000035a3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x35A3 24284 bytes
SHA-256: b1de6bd2bb3c474ba1f7e1a5231a051472c3f40c679cc13ba1cb833e7f9023c9
font_01_sfnt_off00006d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D1E 18448 bytes
SHA-256: 1515dea36b54f390db2656cd1e78578212b0857dcc74367194bf1f7b23864c35