Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac02098840d2ea9…

MALICIOUS

PDF

30.2 KB Created: 2021-07-19 12:22:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 53e1ed5de4ca1adb87894cc56e99e9e7 SHA-1: 6ebd357683cbc936ce3def1554505998d036c2af SHA-256: 4ac02098840d2ea98827b2eafd4098320aab93057ef8c47f5e40445d4293dcea
170 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a game hack redirector lure, impersonating Facebook. The embedded URL, http://netcdn.tw/app/431946152/free-robux-codes-2021-game-hack, is flagged as malicious and part of a redirector infrastructure. The document body also contains similar calls to action, reinforcing the phishing or malware delivery intent.

Machine Learning

  • Nyx PDF Classifier clean score 0.0560

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: http://netcdn.tw/app/431946152/free-robux-codes-2021-game-hack.
  • 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/431946152/free-robux-codes-2021-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_off00001ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FF2 22548 bytes
SHA-256: 4f59fa815f735d8d940674a81e75cadb5afad922e83145f5f95d24551f01d4d1
font_01_sfnt_off000052ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52AB 18776 bytes
SHA-256: 86719edcafa38007f3fc56311acd0ad5bd2c3683937e8590d35305e3fc241c35

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