Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ca97c291edd47e…

MALICIOUS

PDF

37.6 KB Created: 2021-05-18 03:34:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: def2107ada4d25868440e0b8834f59dc SHA-1: 52216bc678a35e808a9b4d5f7639650a3574a721 SHA-256: 21ca97c291edd47e3052baa41b5b510b9d9bb7f0db5effda5e2c31d56a370146
130 Risk Score

Malware Insights

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

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising a 'free generator / game hack'. The document body, though partially corrupted, contains text related to free Robux and a generator, reinforcing the lure. The presence of embedded URLs and the nature of the redirector strongly suggest an attempt to lead the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

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 https://netcdn.xyz/app/431946152/how-can-u-get-free-robux-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_off000034a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34A7 25552 bytes
SHA-256: a2ee925778eb2017782eb2a02d5bbed5045457b25ce73c610afeaadbc87fa12c
font_01_sfnt_off00007071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7071 18696 bytes
SHA-256: 6d387a6157482ae5d4424ea2a1b018d5f079fe6dbc45eeb2149446a5bd008250

Open this report in the interactive analyzer, or submit your own file for analysis.