Malicious PDF — malware analysis report

Static analysis result for SHA-256 db58910b7e74336d…

MALICIOUS

PDF

39.5 KB Created: 2021-05-11 09:02:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9e0f6cc4e0339d849a616a5b2a0d833a SHA-1: 69bc75cdccb862bee71440c60e1d52fa989e8851 SHA-256: db58910b7e74336d608e27d9762196008f138ec9e36afea3aa2413ba072b9349
170 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirection and a fake CAPTCHA lure, designed to trick users into clicking a link. The primary embedded URL points to a known malicious redirector infrastructure. While no scripts were explicitly extracted, the PDF structure and heuristics suggest an attempt to deliver a payload or lead the user to a malicious site.

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/406889139/free-appsfor-coin-master-daily-rewards-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
stream_003_off000033b0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33B0 25040 bytes
SHA-256: 9480bedbdc659a98cd59602d48cd4419dffc565a1bcbe4652b73c0ea59c319e7
font_01_sfnt_off00006c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C93 3204 bytes
SHA-256: 8c2546387700f45186c395d475006178ee984eabbc175bcf1ee6eb58ba8b57aa
font_02_sfnt_off00007797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7797 18648 bytes
SHA-256: 71ac04cffa71c9bf594e3caaf5f74bb84b218965b92dd7062f0876fd9732766f

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