Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f44a5dcc6b5606…

MALICIOUS

PDF

42.3 KB Created: 2021-05-17 23:35:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: f2ac58b103ae4d0821bb6aaf5fe7005b SHA-1: 6104cc6e50fc824bacaacda82da7f8c8a827e890 SHA-256: a1f44a5dcc6b56061bf82177d4271996a9c537d1d2b70ddb38c00db8b92f550a
210 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for free Robux, impersonating Facebook and directing users to a malicious URL. This is combined with a fake CAPTCHA prompt, suggesting an attempt to trick users into executing further actions or providing credentials. The embedded URL is known to be associated with malicious redirectors.

Machine Learning

  • Nyx PDF Classifier clean score 0.0125

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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-get-800-robux-for-free-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-get-800-robux-for-free-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000336c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x336C 30052 bytes
SHA-256: f110eb9424f4ed815b5f244d65f32fd6ec82b3cad368645cce6b5d13a36f35ce
font_01_sfnt_off000078fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78FA 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off000082a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82A9 18664 bytes
SHA-256: 6a64e7471bea66bf256778f320a62da21f5461e8ce3828893f1d9cd09bca5c64

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