Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1190f3903b90f2b…

MALICIOUS

PDF

37.5 KB Created: 2021-05-12 06:17:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: f131f089f87eae0afa9c54d0baeda64c SHA-1: 52fa9c6f6bbeab7d434db711c3281c10a939725b SHA-256: e1190f3903b90f2bb04fb4dd26e9b136456aa0ec9703bd9b9a6d4084a0aba54c
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 a "Roblox Robux Generator Tool" page, impersonating the Facebook brand to trick users. This lure is associated with credential phishing or malware delivery. The document body and heuristics indicate a malicious redirector is used to facilitate this attack.

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/roblox-robux-generator-tool-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/roblox-robux-generator-tool-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_off0000322b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x322B 26660 bytes
SHA-256: 0eba7b56948f898ed77e8b523c1c68a383e09637382880beb63412aff826c68f
font_01_sfnt_off0000712c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x712C 18256 bytes
SHA-256: d3f4191cb905e11e15b1a275d00a7cd931df57561d027c5bc59f2434de0157e6

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