Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c6ff8d8ceb88d3…

MALICIOUS

PDF

36.5 KB Created: 2021-05-22 06:18:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 6a4480ab1b0ad67d7f671dcb7433199e SHA-1: ccc0f031a39363fc887beba1bc498a53823813c8 SHA-256: c3c6ff8d8ceb88d387374f00a12f16f26a31c39e58dab29ea2005fb2174efbd8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links disguised as 'free generators' or 'game hacks' for popular games like Robux and Coin Master. The primary link, 'https://netcdn.xyz/app/431946152/how-to-earn-free-robux-game-hack', is flagged as a malicious redirector. This suggests the document's purpose is to redirect users to potentially malicious websites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

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/how-to-earn-free-robux-game-hack In PDF document text
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/free-robux-easy_GM431946152.pdfIn PDF document text
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/robux-apk_GM431946152.pdfIn PDF document text
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/coin-master-hack-2021-download_GM406889139.pdfIn PDF document text
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/free-coin-master-cheats_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_off00003351.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3351 24920 bytes
SHA-256: 630f68b60d6091d3fbad5ba418a63d2bade562384d0caa1e017f807371745db7
font_01_sfnt_off00006cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CDA 18404 bytes
SHA-256: 14292e34eda5b41bb4f7162ff4266963adc8cc9da2edd2eb943feb3a845ce32e

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