Malicious PDF — malware analysis report

Static analysis result for SHA-256 89936f624eab5b7d…

MALICIOUS

PDF

39.7 KB Created: 2021-05-11 04:39:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 2e65b33a028dfad0279e18ba168a3aa1 SHA-1: c82dee7e5b9bc27c7eeca4e5897a1c3e052974ed SHA-256: 89936f624eab5b7daa555cecd48de0b9a8510d5fa8eca9d76998e6cec3e7fe03
170 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically promoting a 'free Robux generator' and impersonating the Apple brand to facilitate credential phishing. The document body explicitly contains calls to action such as 'CLICK HERE TO ACCESS ROBLOX GENERATOR', indicating a clear intent to trick the user into navigating to the malicious URL. The presence of PDF-specific heuristics like 'PDF_GAME_HACK_REDIRECT_LURE' and 'PDF_MALICIOUS_REDIRECTOR_LINK' strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

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/free-robux-group-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/free-robux-group-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_off00003212.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3212 32136 bytes
SHA-256: 21d93b11fd5bd74ebb7fd132dbf6712259bc949d0c22e6f9e653d456082f0ed4
font_01_sfnt_off00007a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A56 18192 bytes
SHA-256: 388213afa323ee085de7e38d37e80f389e12e91d2d5a1b35e5038c11a526558f

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