Malicious PDF — malware analysis report

Static analysis result for SHA-256 d261dde520b94c00…

MALICIOUS

PDF

34.2 KB Created: 2021-05-23 17:17:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ae793d7bb09da44d61edab5adc8d6549 SHA-1: ebbe4f03939f7ac01a8dc496200c4b4193310006 SHA-256: d261dde520b94c0083362a8114af3ec15cfc67ea2e98454b67f73a51f04e8153
180 Risk Score

Malware Insights

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

The PDF contains a malformed stream and links to known malicious redirector infrastructure, specifically advertising a "free generator / game hack". The ML classifier also flagged this PDF with high confidence. The embedded URLs likely lead to further malicious content or phishing pages, and the document body contains a call-to-action to download the generator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9719

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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-likes-app-game-hack In PDF document text
    • http://arhi-z.ru/images/roblox-robux_GM431946152.pdfIn PDF document text
    • http://arhi-z.ru/images/minecraft-xbox-360-free_GM479516143.pdfIn PDF document text
    • http://arhi-z.ru/images/free-minecraft-generator_GM479516143.pdfIn PDF document text
    • http://arhi-z.ru/images/best-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://arhi-z.ru/images/free-tiktok-like_GM835599320.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_off00002eca.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2ECA 24052 bytes
SHA-256: 6af2d676f12a6d5d3e88b3529cf572d4adb5f46579a1bf0525bbf2859510714a
font_01_sfnt_off00006611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6611 17632 bytes
SHA-256: 7e13fbc4119f45c5ff512709f8e7b8078fcbed6cc64991a23ef627420002bfc1

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