Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a7c19f0f8965000…

MALICIOUS

PDF

38.5 KB Created: 2021-05-18 04:00:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6286e63f3e16ccb42f81acd0696e16f5 SHA-1: 4858c4025526a1282fc1d43a1b36919e3d737304 SHA-256: 9a7c19f0f896500028ec0e377e21c8291f4df251c65da9f51c8a05339b63b429
170 Risk Score

Malware Insights

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

The PDF document uses a lure related to 'free Robux' and a fake CAPTCHA to trick users into clicking a malicious link. This link, 'https://netcdn.xyz/app/431946152/free-robux-generator-no-human-verification-or-survey-2021-game-hack', redirects to known malicious infrastructure. The document's structure and content strongly suggest it's designed as a phishing or scam attempt, likely leading to further malware download or credential theft.

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.
  • 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
  • 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-generator-no-human-verification-or-survey-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_off00003474.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3474 26204 bytes
SHA-256: 0743aa67f0c19e0538340742aea79c595ffc43e032cd5d6ab9b7b2f37a139dc0
font_01_sfnt_off0000717e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x717E 19556 bytes
SHA-256: 3a60cdb248c638d1e974f8488a9d0c49865e0dbecbd8cc682acbe36144e2e86e

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