Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c1da23f8dd91c8…

MALICIOUS

PDF

38.0 KB Created: 2021-05-21 07:31:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b09fb5f6760234c7d9d3931cdc973818 SHA-1: abfc21c160be985e3dc993015dc3d81ff08ddc1b SHA-256: a5c1da23f8dd91c8c8528f83385cd8fcbef17b5a15f8faeee82687a2a6393f72
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one identified as a malicious redirector for a 'game hack' lure. The document body and embedded artifacts suggest an attempt to trick users into visiting the malicious URL, likely to download further malware or engage in phishing. No scripts were extracted, but the presence of embedded links and the ML classifier's high confidence indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9407

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/431946152/roblox-hacked-com-2021-game-hack In PDF document text
    • https://www.air-shop.cz/images/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • https://www.air-shop.cz/images/krnl-roblox_GM431946152.pdfIn PDF document text
    • https://www.air-shop.cz/images/cm-spins_GM406889139.pdfIn PDF document text
    • https://www.air-shop.cz/images/robux-rewards_GM431946152.pdfIn PDF document text
    • https://www.air-shop.cz/images/free-coins-coin-master-blog_GM406889139.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_off00003504.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3504 25840 bytes
SHA-256: 9b2995a55ee965ea6a02daccc54563b720a417b8a7f623f2f12956a5c867f8b9
font_01_sfnt_off00007103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7103 19016 bytes
SHA-256: 1bdffeea421802d48c0c5f4972bc43262882194040db90b4400103ab0d186a68

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