Malicious PDF — malware analysis report

Static analysis result for SHA-256 761532394c0cd5f3…

MALICIOUS

PDF

38.3 KB Created: 2021-05-10 10:44:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2ab46293a554107bc16690758a03d765 SHA-1: 73f204c78a0c313c858011798b7e921c1bfc4b48 SHA-256: 761532394c0cd5f38189584b93449004ced22fb88e8b3b865925eeb2239573f4
170 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector disguised as a 'free generator' or 'game hack'. The document body and heuristics indicate a fake CAPTCHA or human verification prompt is displayed to trick the user into interacting with the malicious link. No scripts were extracted, but the overall pattern suggests a phishing lure designed to lead to further malicious activity.

Machine Learning

  • Nyx PDF Classifier clean score 0.0128

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/431946152/free-roblox-accounts-2021-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000342b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x342B 23472 bytes
SHA-256: 0764e8a7d29c9c7ba9f2d40905ae41153b1834239efd630ffa85ac80f63f6d50
font_01_sfnt_off00006953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6953 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off00007304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7304 18596 bytes
SHA-256: 22cfe7717cbde525e358518c643d16773849ea10ba84c2e1869734c310f91593

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