Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b019ca521e0bbb…

MALICIOUS

PDF

36.4 KB Created: 2021-05-20 03:24:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: cd369209c208db18515f4c05136b8ef8 SHA-1: e415335ffccae1e1ca18e49a5a45f67170a2ee8f SHA-256: b8b019ca521e0bbb57b09adf6d9de4309c85f1f59f266638b9bdf185925b9d91
170 Risk Score

Malware Insights

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

The PDF document contains embedded links that impersonate Facebook and promise free game currency, a common lure for credential phishing. The primary link directs to a known malicious redirector infrastructure, indicating a high likelihood of further malicious activity. No scripts were extracted, but the document's structure and embedded links strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier clean score 0.0312

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/406889139/free-coins-and-spins-for-coin-master-game-game-hack.
  • 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/free-coins-and-spins-for-coin-master-game-game-hack In 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_003_off00003559.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3559 24300 bytes
SHA-256: 912aa4988db7eeeb5832adde7d94260382d70c9a2a6fccdb99506a1c1197db5b
font_01_sfnt_off00006cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CFD 18320 bytes
SHA-256: 2c95db8d02702652075be8f6568e083e0c31fb28563b2fbbcaccc1dd0c48c672

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