Malicious PDF — malware analysis report

Static analysis result for SHA-256 104fbd836ff90d2c…

MALICIOUS

PDF

37.9 KB Created: 2021-05-23 07:34:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a780a1d40fdf726b19d957e9db8132a9 SHA-1: 8214a890ffdb701588caf448d98ace15f5b60e7d SHA-256: 104fbd836ff90d2c01dd2818d5d23b7b48809bb2c5a0c539c8d07cad33b119e5
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors, specifically advertising 'free generators' and 'game hacks' to entice clicks. The document body and heuristics confirm these links lead to infrastructure associated with malicious activity. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to exploit vulnerabilities or trick the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7010

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-game-hack In PDF document text
    • http://rzt.com.ua/images/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://rzt.com.ua/images/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://rzt.com.ua/images/robux-xyz_GM431946152.pdfIn PDF document text
    • http://rzt.com.ua/images/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://rzt.com.ua/images/free-robux-hack-2021_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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000030b3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30B3 24856 bytes
SHA-256: 2163d7b162bec1ad0b9b9ebcae696647fb12283840fb32fd35420c1bb394a36d
font_01_sfnt_off00006a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A64 2896 bytes
SHA-256: c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd
font_02_sfnt_off00007449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7449 17692 bytes
SHA-256: ba2215a0f2290c6faad19fe6968ba231152e54b1cb241ca137cf69db350684c8

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