Malicious PDF — malware analysis report

Static analysis result for SHA-256 d520ff5bc9ec83e6…

MALICIOUS

PDF

35.5 KB Created: 2021-05-30 06:52:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 085358718f4e9b316f2857ef3c84200d SHA-1: 012730f2594bf2c4d0fe4e6553a88b9c4058c3b3 SHA-256: d520ff5bc9ec83e6bf3d4a8aece08ef186dc187754f0d8973d457d78512c95a4
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to redirector infrastructure, specifically advertising 'free generators' and 'game hacks' to lure users. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent. The document body also contains a call to action to download a TikTok generator, further supporting the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9508

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/835599320/free-tiktok-followers-no-human-verification-or-survey-game-hack In PDF document text
    • https://holycrossintercollege.com/wp-content/uploads/fsqm-files/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • https://holycrossintercollege.com/wp-content/uploads/fsqm-files/minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • https://holycrossintercollege.com/wp-content/uploads/fsqm-files/free-robux-generator_GM431946152.pdfIn PDF document text
    • https://holycrossintercollege.com/wp-content/uploads/fsqm-files/minecraft-pe-hacks_GM479516143.pdfIn PDF document text
    • https://holycrossintercollege.com/wp-content/uploads/fsqm-files/free-minecraft-survival-server_GM479516143.pdfIn 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_002_off000030fa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30FA 23992 bytes
SHA-256: 61a2d325ec27c540d95a05d98ea6dfc475e18da709e03b60637ac72c1e062a43
font_01_sfnt_off000067f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67F5 18748 bytes
SHA-256: 6c56a9102827ae6ceba4f8b38934fd9fcdc3c6624088a0c8a681a3e50045d012

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