Malicious PDF — malware analysis report

Static analysis result for SHA-256 9423b9a7b98de772…

MALICIOUS

PDF

36.4 KB Created: 2021-05-16 19:02:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: af5f8213e17a9254a0b93ce3ebedc519 SHA-1: 751fb5c77dad79a223001840eafefc8ac7f4452d SHA-256: 9423b9a7b98de77213a569d29e8edf5358e81a63e89dc774a37bd26ff305aaf5
170 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it's a lure for a 'free generator' or 'game hack', impersonating Microsoft to phish for credentials. It links to malicious redirector infrastructure, suggesting an attempt to download further malicious content or redirect to a credential harvesting page. No scripts were extracted from this sample, but the embedded URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier clean score 0.0272

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/431946152/how-to-earn-robux-for-free-2021-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/431946152/how-to-earn-robux-for-free-2021-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_off00003355.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3355 23764 bytes
SHA-256: 620e94cc85a1dac8883e477522e4c6f99b7b03ce275cf2a6d23b71a0939ab4a9
font_01_sfnt_off000068bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68BD 19564 bytes
SHA-256: b6cbe85e9a0a3498c0cc6f3fcaa348433f1e6448c74905cadbb33a69e7c27e08

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