Malicious PDF — malware analysis report

Static analysis result for SHA-256 621e5ab00310dae2…

MALICIOUS

PDF

39.9 KB Created: 2021-05-13 13:01:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: ce0e03362d81ad446edb9ab99edfb932 SHA-1: 99c026bb2ff1206f390bc5fab700b1070a0c3cac SHA-256: 621e5ab00310dae2e40b365b7742deb6cd298ab3cc96d6092b1c2ba614992968
130 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic indicating it links to a malicious redirector disguised as a game hack generator. The embedded URL, 'https://netcdn.xyz/app/406889139/haktuts-2021-coin-master-free-spin-link-game-hack', is identified as malicious infrastructure. The document body also contains similar text, reinforcing the lure. The presence of a download button heuristic further supports the malicious intent of directing users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

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/406889139/haktuts-2021-coin-master-free-spin-link-game-hack In 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_003_off00003455.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3455 34428 bytes
SHA-256: b528a3381e017a2f3f29d1dafdde51161368120cc9a82eeefbdc6edf35ba056e
font_01_sfnt_off00007a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A11 18600 bytes
SHA-256: 0377bed8f11e9d33b4e58dd3bbc318f67a9398bad3c38ecff466878595338458

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