Malicious PDF — malware analysis report

Static analysis result for SHA-256 051358b7c073efa4…

MALICIOUS

PDF

33.3 KB Created: 2021-07-19 20:03:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 2b3b84a4851bf2e6a47dca2891969ff4 SHA-1: 4a915efc45e2783d3d68598cb51a41054163773b SHA-256: 051358b7c073efa4e2c86406eea28e2cd412e6f3de0ad4a039eea4b8e6856fdd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to known malicious infrastructure, specifically promoting 'free generator' or 'game hack' lures. The document body and embedded links strongly suggest a phishing attempt to trick users into visiting malicious sites, likely for credential harvesting or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/431946152/how-to-get-free-robux-easy-no-download-game-hack In PDF document text
    • http://unc-europe.com/images/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://unc-europe.com/images/promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://unc-europe.com/images/is-minecraft-free_GM479516143.pdfIn PDF document text
    • http://unc-europe.com/images/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://unc-europe.com/images/free-tiktok-views_GM835599320.pdfIn PDF document text
    • http://unc-europe.com/images/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://unc-europe.com/images/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • http://unc-europe.com/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://unc-europe.com/images/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://unc-europe.com/images/how-can-i-get-free-robux_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_off00002b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B66 22432 bytes
SHA-256: d8080d493c4d1b3fd10284495fa758e01f6e8f0e07b3ffcbac1413fc41781a8f
font_01_sfnt_off00005d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D16 19292 bytes
SHA-256: 54df6ab7cbd8da040d3fc0d471fd38ed670923c029d75c86ffa3c2631ce9a33c