Malicious PDF — malware analysis report

Static analysis result for SHA-256 f619e5927b8255ae…

MALICIOUS

PDF

34.5 KB Created: 2021-05-24 09:06:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 3bebb6ed028077607a42aa6313bba8a9 SHA-1: c807101d12ae0ee536d2835751daabd580d88094 SHA-256: f619e5927b8255aeea9bb1af3af1d43430c12253f47880b226ce5de47b417264
170 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1071.001 Web Protocols

The PDF file contains a lure for a 'Free Robux Hack Generator' and impersonates Facebook, directing users to a suspicious URL. This indicates a likely credential phishing or malware distribution attempt. The embedded URL is associated with malicious redirector infrastructure, suggesting the document is designed to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier clean score 0.0718

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-hack-generator-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-hack-generator-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_002_off00002d25.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2D25 24332 bytes
SHA-256: 2aa6104aaa33ac93a5e5b9f6edeaf0c0f3f0de4bed3bb60e82454c6b2e461a36
font_01_sfnt_off000064d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64D2 18516 bytes
SHA-256: ac45002ee2c78c55a094f6344a5e95abe10f4ed7f4298fc77d5376065a98214b

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