Malicious PDF — malware analysis report

Static analysis result for SHA-256 410e2d8f3e0fbcbe…

MALICIOUS

PDF

39.9 KB Created: 2021-06-07 10:44:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e5a1f1bebb5532a8e22b89b30848db5e SHA-1: 4b422709dc13e515d007c6b963465e810ce31daa SHA-256: 410e2d8f3e0fbcbe14325fc0d5ded778adade9a4b5fd7044de34e6178cde4152
170 Risk Score

Malware Insights

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

The PDF document exhibits malicious behavior by presenting a fake CAPTCHA and a lure for a game hack, directing the user to a known malicious redirector URL. This is a common tactic to entice users into downloading further malware or visiting compromised sites. The embedded URL is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier clean score 0.0331

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.tw/app/431946152/how-to-hack-robux-2021-february-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_004_off000037f6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37F6 28136 bytes
SHA-256: 097fed60b7c2ae001d2176926ca2ee14fdca1370413f2e2cdd57eed61ec363bf
font_01_sfnt_off000077d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77D9 19160 bytes
SHA-256: 415dbf7e2fcd3bdbc2c818b6d5ce20f2e32d75b2fbf3cc17fac65a42f9c94a5f

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