Malicious PDF — malware analysis report

Static analysis result for SHA-256 1591cbca6eaa321c…

MALICIOUS

PDF

35.2 KB Created: 2021-05-21 16:03:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b7c56ef5db862b5bf6644a3939454a88 SHA-1: ccc76b1d4db3230e5394d074f1f2ac686fa52d56 SHA-256: 1591cbca6eaa321c83f95ed3f7207a4fa7fdf93353fd640aa6ecd2b8d09d1571
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple links to external websites, with a primary focus on a 'free generator / game hack' lure. The 'SE_CLICKFIX' heuristic indicates the document likely instructs the user to execute a command or open a link, a common social engineering tactic to bypass security measures. The ML classifier also flagged the PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

Heuristics 6

  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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/is-minecraft-vr-free-game-hack PDF link annotation
    • http://pesok-rk.ru/images/instant-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://pesok-rk.ru/images/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://pesok-rk.ru/images/free-robux-sites-2021_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/free-daily-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://pesok-rk.ru/images/free-robux-that-actually-works_GM431946152.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_off0000318c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x318C 24932 bytes
SHA-256: a54d92b8d0ff291dd60d3775995db939934b10caf3e11f26021a297965f0a68e
font_01_sfnt_off00006a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A21 17704 bytes
SHA-256: 8bb0636472a21c77c03eb179316ec7672ebaf2fffc2d381e43d3ff9b7c84c5d1

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