Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c0acf3fdb73a7bd…

MALICIOUS

PDF

35.7 KB Created: 2021-07-08 00:35:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: decb574d1ed4f277581f07697433559a SHA-1: 34884b61aa3a640a39f4ef4656f7686abecfc227 SHA-256: 2c0acf3fdb73a7bdf8b4ae9b3894f351fcbe4b731b7befd5ea58d11a2452be59
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links, including one identified as a malicious redirector. The primary lure is a "free generator / game hack" for Robux, which directs users to the malicious URL http://netcdn.tw/app/431946152/how-to-get-free-robux-without-verifying-2021-game-hack. This indicates a phishing or scam attempt designed to lead users to potentially harmful content or further malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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-without-verifying-2021-game-hack In PDF document text
    • https://yowchang.com/image/data/files/i-need-robux_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/roblox-conquerors-hack_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/hackers-that-hack-robux_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/free-money-codes-on-roblox-skywars_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/get-free-robux-now_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/robux-free-c_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/btools-hacks-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/coin-free-spin_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/coin-master-free-spins-moonactive_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/robux-app_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/i-hacked-lolpuggys-roblox-account-ha_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/fake-robux-codes_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/minecraft-noob-vs-pro-vs-hacker_GM479516143.pdfIn PDF document text
    • https://yowchang.com/image/data/files/roblox-hack-app_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/troll-avatar-roblox-free_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/hacks-for-roblox-legit-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/www-roblox-com-robux-free_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_off000031b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31B2 22172 bytes
SHA-256: 4375ddb4d0cfdf502ba9b0a5277cac69e14d35a05b24d9ef0c96669d97b762f0
font_01_sfnt_off000062ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62FF 20184 bytes
SHA-256: da7d406aba47eea6317da3ede96973437af681d442b83efbb40dfbc95f86b21f

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