Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb8bffa982f8195c…

MALICIOUS

PDF

28.5 KB Created: 2021-07-18 23:43:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 846f2e82bcc4fee7a044ba742b08043a SHA-1: 260d337c9838f15ba80ac27b831f83c8fab3375a SHA-256: bb8bffa982f8195c3e2446ddbd1dec8c962f2692282b19521e80a9eb86fceea5
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 0.8791

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/479516143/minecraft-pe-free-game-hack PDF link annotation
    • https://www.impactfoods.co.uk/images/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • https://www.impactfoods.co.uk/images/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://www.impactfoods.co.uk/images/how-to-get-minecraft-for-free-on-iphone_GM479516143.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
font_00_sfnt_off00002115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2115 21372 bytes
SHA-256: a4fd4807ab6db4ae829f2da35a137919fd0bf0b611562a0d5926e20a7facd0a4
font_01_sfnt_off00004f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F4B 17724 bytes
SHA-256: f623db3d5896acbfca75c1fa71b49e9ae1d6d1c000a87567f3c2fb9ea3a364ca

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