Malicious PDF — malware analysis report

Static analysis result for SHA-256 d082073b0bfa83dc…

MALICIOUS

PDF

41.3 KB Created: 2021-05-23 18:59:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a51104b47fe653fb203318ed66728289 SHA-1: 31563e1f894d4728cc073de96b883639b10814a6 SHA-256: d082073b0bfa83dc2bbc101f071085d46e85641a5612058876038a170d20d045
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1553.005 Mark-of-the-Web Bypass

The PDF document contains heuristics indicating it's a lure for game hacks and brand impersonation (Facebook), directing users to a suspicious URL. The document body explicitly mentions "Robux Hack" and "CLICK HERE TO ACCESS ROBLOX GENERATOR", reinforcing the phishing attempt. The embedded URLs and the primary malicious URL suggest a credential phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7409

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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/robux-hack-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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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-hack-game-hack PDF link annotation
    • http://bgnails.nl/images/coin-master-free-spins-link-facebook-page_GM406889139.pdfIn PDF document text
    • http://bgnails.nl/images/best-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://bgnails.nl/images/coin-master-free-500-spins-link_GM406889139.pdfIn PDF document text
    • http://bgnails.nl/images/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000035bc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x35BC 26788 bytes
SHA-256: 5778ba85a050262281e9a51e47710d3ab2d86015dc876a77732545736e89e622
font_01_sfnt_off00007321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7321 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00008033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8033 18248 bytes
SHA-256: dc70545b78036d2d989a53e60713ee6b6ba72604799932bb5b2fc13357d7a02a

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