Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b22acb6282aef6…

MALICIOUS

PDF

36.0 KB Created: 2021-05-21 13:26:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: b4f59b135541b29a8d49d8fbfba66a79 SHA-1: 5154a01e59f866763e6e76401419a887870116d3 SHA-256: f5b22acb6282aef6c85c9f20ea1bc9d3978898dca62b5ceb0d1e395caaa2ff0a
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses an invoice-themed 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 0.9492

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/479516143/how-to-get-free-coins-in-minecraft-game-hack PDF link annotation
    • https://ceranique.nl/images/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • https://ceranique.nl/images/free-robux-working_GM431946152.pdfIn PDF document text
    • https://ceranique.nl/images/roblox-sign-in-free_GM431946152.pdfIn PDF document text
    • https://ceranique.nl/images/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • https://ceranique.nl/images/free-coins-and-spins-coin-master_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_off00003452.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3452 25236 bytes
SHA-256: 7a62006a71168a156a97c7710eaf8c434531c485e06f65de5c058d776c44e55e
font_01_sfnt_off00006cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CAD 17872 bytes
SHA-256: 1b721abad2735a8fbe19a03a2bac086d9eea3fd34ae873613b34203f1596ee94

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