Malicious PDF — malware analysis report

Static analysis result for SHA-256 11130a4656de0bc6…

MALICIOUS

PDF

33.2 KB Created: 2021-07-23 20:34:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b7c5e64394e7df38b6a8214a4fcceaef SHA-1: 853c06489896a8837b4d7a6d54ff7cc8974985a5 SHA-256: 11130a4656de0bc6c090baa5b27ac0e03f9760db7eed96bb8e865d2b9456c51e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links designed to lure users with promises of free Robux and game hacks. These links redirect to malicious infrastructure, specifically the URL http://netcdn.tw/app/431946152/free-robux-no-survey-game-hack, which is flagged as a malicious redirector. The document body and embedded link actions indicate a social engineering tactic to drive traffic to potentially harmful sites.

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/free-robux-no-survey-game-hack In PDF document text
    • http://acp-institut.fr/images/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://acp-institut.fr/images/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • http://acp-institut.fr/images/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://acp-institut.fr/images/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://acp-institut.fr/images/minecraft-free-ios_GM479516143.pdfIn PDF document text
    • http://acp-institut.fr/images/free-minecraft-accounts-reddit_GM479516143.pdfIn PDF document text
    • http://acp-institut.fr/images/free-minecraft-bedrock-server-hosting_GM479516143.pdfIn PDF document text
    • http://acp-institut.fr/images/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://acp-institut.fr/images/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://acp-institut.fr/images/coin-master-15-free-spin-link-of-last-5-days_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_off00002b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B7B 22844 bytes
SHA-256: da37646ed0c24918a4aa64c99d22f087815467fa4fa03a63c7301694103175fb
font_01_sfnt_off00005ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EE9 18496 bytes
SHA-256: f1852515f6cdc259a9f9af6ce41fbc8d14471d9d90ecd59e65f12ed96f7d901b