Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cab0cc53b986062…

MALICIOUS

PDF

32.4 KB Created: 2021-07-20 08:40:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 6cc84ba6f71d3c6c1f496d2a65c87509 SHA-1: 2c4f97fce221a6495acdcb472772224a949022fa SHA-256: 1cab0cc53b98606244c682431e077dc256de8b22f8d9f6065478847a65693a41
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links, including one to 'free robux' that redirects to known malicious infrastructure. The document body and embedded links suggest a lure for obtaining in-game currency, likely leading to a phishing or malware download site. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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/free-robux-without-downloading-apps-game-hack In PDF document text
    • http://www.centromedicoaurora.it/images/freer-pro-tiktok_GM835599320.pdfIn PDF document text
    • http://www.centromedicoaurora.it/images/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://www.centromedicoaurora.it/images/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://www.centromedicoaurora.it/images/how-to-get-minecraft-pe-for-free_GM479516143.pdfIn PDF document text
    • http://www.centromedicoaurora.it/images/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • http://www.centromedicoaurora.it/images/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.centromedicoaurora.it/images/robux-free-online_GM431946152.pdfIn PDF document text
    • http://www.centromedicoaurora.it/images/minecraft-education-free_GM479516143.pdfIn PDF document text
    • http://www.centromedicoaurora.it/images/minecraft-realms-free_GM479516143.pdfIn PDF document text
    • http://www.centromedicoaurora.it/images/coin-master-free-stuff_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
font_00_sfnt_off00002768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2768 21716 bytes
SHA-256: 373115f53bee15effdfc85ee73e7c5bbb15804cce7826c0be55cdb67efe4c317
font_01_sfnt_off0000573b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x573B 20060 bytes
SHA-256: a8fbfe7f7d9ee5c6d1e0a9d54f6a8f2618b4750cae31927e831424281ea5393b