Malicious PDF — malware analysis report

Static analysis result for SHA-256 4882aab746f6a3b3…

MALICIOUS

PDF

35.8 KB Created: 2021-05-10 11:15:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 41d26ed7ba3c0ea207391ad3ba130dff SHA-1: 0752efde14aa2314ee1dbc08b4e489bf8f2e815f SHA-256: 4882aab746f6a3b30e044eb311a68b0e76688c39fcc5247fea076d81b199bb45
170 Risk Score

Malware Insights

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

The PDF document contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a fake CAPTCHA lure. The document body explicitly mentions "Robux Earning Websites" and "CLICK HERE TO ACCESS ROBLOX GENERATOR", reinforcing the phishing pretext. The primary IOC is the malicious URL used in the lures.

Machine Learning

  • Nyx PDF Classifier clean score 0.0282

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/robux-earning-websites-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_off0000308c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x308C 24528 bytes
SHA-256: 0511b57d2cf2a7ba0fa2d043eb91c606ff73c4d858ae4af2bdf1329a99c59323
font_01_sfnt_off000068b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68B8 18788 bytes
SHA-256: bd39057800d0036914d6d0737aa3197ac1fc2fb4678f369ab3a988c9d4b4e699

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