Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9cfd40f20b14b38…

MALICIOUS

PDF

39.6 KB Created: 2021-05-23 01:14:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 141f5792e9541bcfc7907ce8b34451ce SHA-1: b958aa46d59c8f04333b623ffe99615e740f028a SHA-256: c9cfd40f20b14b389ec78f8bf9cfc338ad709286e4b2ccfd44b1201215b3d1a6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector infrastructure, specifically advertising 'free Robux codes' and 'game hacks'. One critical heuristic identified a link to known malicious redirector infrastructure, and the ML classifier also flagged the PDF as malicious. The document body contains explicit calls to action and URLs that likely lead to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

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 https://netcdn.xyz/app/431946152/free-robux-codes-no-verification-game-hack In PDF document text
    • http://rwathia.com/images/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://rwathia.com/images/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • http://rwathia.com/images/get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://rwathia.com/images/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://rwathia.com/images/flip-master-free-coins_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000032a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32A5 25712 bytes
SHA-256: c81e0b9afe689f076e0c581b7f0edc0edadc7fa33fcd771c87620b70191b44f0
font_01_sfnt_off00006dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DDA 2840 bytes
SHA-256: 787e0768241fb57660bcc9c7f726cf687277c463cdf8c586c4782ee9d03c3606
font_02_sfnt_off00007799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7799 18776 bytes
SHA-256: 1501cc25bcf8c3b3bf9df14f68216c1cc39cc5b0131e4343b63bafa21afb9c06

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