Malicious PDF — malware analysis report

Static analysis result for SHA-256 822b73ec754af371…

MALICIOUS

PDF

38.8 KB Created: 2021-05-20 21:37:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ebb1fea31408593343b261a6dfbc3d1c SHA-1: 2c4ec31ce7d5aafdc5d815d82e70cbc0bdc9bfd7 SHA-256: 822b73ec754af371f9f82799d4b54f7fd2f537b64f65f7996a4e10bd0be8d550
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 0.8060

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/406889139/free-spins-coin-master-hack-2021-game-hack PDF link annotation
    • http://korporacjaroma.pl/images/is-coin-master-free_GM406889139.pdfIn PDF document text
    • http://korporacjaroma.pl/images/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://korporacjaroma.pl/images/how-to-make-a-minecraft-server-for-free-java_GM479516143.pdfIn PDF document text
    • http://korporacjaroma.pl/images/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://korporacjaroma.pl/images/coin-master-free-spins-hack-but-no-surveys_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_off00003538.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3538 23860 bytes
SHA-256: f3789da9f7fd3ec9552814aa77287cce080d108c7e5d360e0092261ecb4d34f7
font_01_sfnt_off00006bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BAC 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off0000755d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x755D 18456 bytes
SHA-256: 8f74d6ddd2abce9f563610cbfcc253ce51c057807514da134dc64dcb58b7111e

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