Malicious PDF — malware analysis report

Static analysis result for SHA-256 d21afedcd90cbc69…

MALICIOUS

PDF

35.7 KB Created: 2021-05-22 10:48:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b22040f63b7a526fc83818292811c503 SHA-1: 2b432b98af42c8de1d0ec4af2d9a27fd6970e4fe SHA-256: d21afedcd90cbc69981ada4f11c48624694d62142d7641be31612e4f8e55099f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirector links, specifically targeting users with lures for game hacks and free currency. The document body and embedded URLs reinforce this by advertising generators and hacks, ultimately pointing to suspicious domains. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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/how-to-get-free-tiktok-coins-game-hack In PDF document text
    • http://yochin.org.tw/images/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/roblox-jailbreak-hack_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/fast-robux-online_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/toolbox-premium-apk_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_off00002fd3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FD3 26264 bytes
SHA-256: a37ff0f5430454fc3dc4bdab680b10d54940dd7bce2418a1d6f633adab1732ee
font_01_sfnt_off00006c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C57 17620 bytes
SHA-256: 5e08b925a0f8fe2d80e54c1999b1c3763f905cccf1acde0f5739739445e42325

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