Malicious PDF — malware analysis report

Static analysis result for SHA-256 b93431c646c88920…

MALICIOUS

PDF

35.1 KB Created: 2021-05-24 12:17:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: fa1429ac6b2ac87edb243f922bf07f9a SHA-1: ac8ecbcc1e8d5ef2c7277943bb3b759d41006d44 SHA-256: b93431c646c88920bacd9a9e9cb48346f18c1ae532d547324e6f9c89e61ebbb7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and lures users with promises of free game hacks. The primary malicious URL is https://netcdn.xyz/app/835599320/free-tiktok-hearts-game-hack, which is presented as a 'free generator / game hack'. The document also contains embedded links to other PDF files hosted on bernd-voehringer.de, which may serve as further lures or part of a download chain. No scripts were extracted, but the presence of malicious links and the ML classifier output strongly indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

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-hearts-game-hack In PDF document text
    • http://bernd-voehringer.de/images/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://bernd-voehringer.de/images/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://bernd-voehringer.de/images/coin-master-pc-game-free-download_GM406889139.pdfIn PDF document text
    • http://bernd-voehringer.de/images/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://bernd-voehringer.de/images/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000318d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x318D 24444 bytes
SHA-256: 96b9abf5e0706ac19c5d41bd78c6c00f3d17bfe29944fa85d065693f1de71878
font_01_sfnt_off0000698f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x698F 17684 bytes
SHA-256: d2d02d8ba990aafabbf3c8139bcf1f40ce6ab80109d0e8cf226d19766131c391

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