Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1db6155fc2becb1…

MALICIOUS

PDF

38.7 KB Created: 2021-05-21 11:41:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 74d5f031e61fa4b9cada74af698829b4 SHA-1: 8bb4d07d179f31b6d0ce474ad013f00dbc8f793b SHA-256: b1db6155fc2becb1102a8d6ee3c64819f1b02da18d891f17d763d4a12d717da0
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 0.9476

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 https://netcdn.xyz/app/431946152/free-robux-generator-2021-game-hack PDF link annotation
    • http://www.hlad.hr/files/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/doctor-louie-roblox_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/tiktok-bots-free_GM835599320.pdfIn PDF document text
    • http://www.hlad.hr/files/how-to-change-roblox-name-for-free_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/free-spins-coin-master-haktuts_GM406889139.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_off00003382.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3382 29560 bytes
SHA-256: 7e9a73f04865723a1ba33b8764eee40995f6d4117c3b185e649c767436c4538b
font_01_sfnt_off0000749a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x749A 18748 bytes
SHA-256: fca1806ffff7593a0a2d811b077fe14576afb362c0c2e8ffc695fbf8edc3964d

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