Malicious PDF — malware analysis report

Static analysis result for SHA-256 c640e009f474d089…

MALICIOUS

PDF

32.9 KB Created: 2021-07-20 16:10:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9f94afe4ebb1f221cbfdafabcf3ff1b3 SHA-1: a36a0ce600be6f24b1dc657bbf093384ba8b9a5b SHA-256: c640e009f474d089f67a19f02f0afd359a18037a641b57aaa42990fdd34609ee
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a fake CAPTCHA and a download lure, directing users to a known malicious redirector. The document's content and embedded links strongly suggest a social engineering attempt to trick users into downloading potentially malicious files, likely related to game cheats or hacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/479516143/download-minecraft-free-hiapphere-game-hack In PDF document text
    • http://ratchadatitan.com/UserFiles/File/hacker-minecraft-song_GM479516143.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/minecraft-pe-015-0-apk-free-download_GM479516143.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/free-likes-on-tiktok_GM835599320.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/minecraft-account-hacked_GM479516143.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/tiktok-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/roblox-hack-game_GM431946152.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/free-spins-coins-coin-master_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_off00002c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C15 22308 bytes
SHA-256: e79cd48a5a794acdec355b43553a1da91d1e302d08ddbeaf47c6b303781474b8
font_01_sfnt_off00005d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D8D 18632 bytes
SHA-256: d5148a3ebf6685d38fa7a82d6609f6f0baf7c57c3f299eff6d795086d297ed64

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