Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcc9f3b6863b02e1…

MALICIOUS

PDF

29.4 KB Created: 2021-07-22 22:16:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1daf1071ac0a82c7dcdc0c2a71b07084 SHA-1: cd81f482dfe783f0087897780cbd2ec2397ed35e SHA-256: bcc9f3b6863b02e12a3da2d611116d0dc3fb4b6d49e9ef2ad5305a066386deb2
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector infrastructure, masquerading as a 'free generator' or 'game hack' to entice users. The document body and embedded artifacts suggest a lure for a malicious download. While no scripts were directly extracted, the nature of the links and the lure strongly indicate an attempt to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier clean score 0.0556

Heuristics 4

  • 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.
  • 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/835599320/free-tiktok-views-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
font_00_sfnt_off00001fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FD3 22712 bytes
SHA-256: bfd168833f8ae04249641db692bd3a33416c281a16bb87d3111e31b6e1551de6
font_01_sfnt_off000052b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52B7 17752 bytes
SHA-256: fbbed6aa406878393a00abdc0937322fa009c5b8448fdc35bdb3145f27770f26

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