Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b7fec23667b65f…

MALICIOUS

PDF

37.1 KB Created: 2021-05-22 21:22:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: dfbe46a8fb7a3e3581a74a257e7ba406 SHA-1: 9f35a92f0bce00fb467c6c65f2846db4a1acd227 SHA-256: 90b7fec23667b65f4f0a20a98383161e8a9e8b26bde2d10eab29f5bd332ea8fa
162 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing and a fake browser/software-install lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

Heuristics 6

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/835599320/free-views-tiktok-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/835599320/free-views-tiktok-game-hack PDF link annotation
    • http://svp-steinmaur.ch/images/coin-master-spin-cheat_GM406889139.pdfIn PDF document text
    • http://svp-steinmaur.ch/images/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://svp-steinmaur.ch/images/robux-hack-tools_GM431946152.pdfIn PDF document text
    • http://svp-steinmaur.ch/images/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://svp-steinmaur.ch/images/free-tiktok-followers-no-survey_GM835599320.pdfIn 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_off000031a7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31A7 27780 bytes
SHA-256: 1a5f4c5046a801fa89680af0bbd2cc85ea58b8ffb8bd1c70562bc8e6bfe1344c
font_01_sfnt_off00007140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7140 17752 bytes
SHA-256: ce4f969b492885a6292b68f2810015e61170a5a05df2656d5db0dd0870788c0b

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