Malicious PDF — malware analysis report

Static analysis result for SHA-256 a424b20a2e9407c3…

MALICIOUS

PDF

31.9 KB Created: 2021-07-20 16:25:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d3de2fe06550a7788fd3b2ec7a1c7542 SHA-1: 139f3ef5a33a1e1c77495015c8e976ea3e200d4e SHA-256: a424b20a2e9407c32ebf7ab83cdab8a9bbd6910bf0ce26e275033bc0f8767d11
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. 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 0.8871

Heuristics 4

  • 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.
  • 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 http://netcdn.tw/app/835599320/free-tiktok-views-game-hack PDF link annotation
    • https://rmmasonry.net/wp-content/uploads/fsqm-files/free-minecraft-pe-server_GM479516143.pdfIn PDF document text
    • https://rmmasonry.net/wp-content/uploads/fsqm-files/freer-pro-tiktok_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_off000028e3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x28E3 23044 bytes
SHA-256: 48d16e036c07ffd58d916c44646a3ff83d809de763131faf54de7e9357770108
font_01_sfnt_off00005c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C9E 17752 bytes
SHA-256: fbbed6aa406878393a00abdc0937322fa009c5b8448fdc35bdb3145f27770f26

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