Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a0b81fc62ce57d…

MALICIOUS

PDF

35.5 KB Created: 2021-05-16 11:03:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: c3812e0696c8b8cd9293d61edd3279ea SHA-1: 3fa952aefc88968e6814f010b3b5d36990430fda SHA-256: 67a0b81fc62ce57d10f0dc2a1563969a0b3057e5e31536be3c2db03128f1f834
170 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains embedded links that lead to a malicious redirector, disguised as a "free generator" for a popular game. The document also displays a fake CAPTCHA, likely to trick the user into interacting with the malicious link. The presence of these elements strongly suggests a phishing or scam attempt designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier clean score 0.0306

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 https://netcdn.xyz/app/406889139/free-coins-on-coin-master-game-hack In 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_003_off0000348d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x348D 24000 bytes
SHA-256: 1986498323b2c5df466d1cbdf8a4783da76f2e45e429e6c47272fbd151b79acf
font_01_sfnt_off00006b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B44 17712 bytes
SHA-256: 6ea46f87f2167b805a87cbef3ad9b5ecf4d2513d7b8c5fe933be1d22f28e2546

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