Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb33b76269cf5757…

MALICIOUS

PDF

29.3 KB Created: 2021-07-19 08:07:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 9fa62ea8540b5d72e05d35a9471cb576 SHA-1: 82f051bb58bb9b782597c9e5b830dbd0c40de5db SHA-256: cb33b76269cf5757dbba6f15794d34a4cb7867d421ae36f4d0f1b5d8fa30b978
130 Risk Score

Malware Insights

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

The PDF file contains multiple links to known malicious redirector infrastructure, specifically http://netcdn.tw/app/479516143/how-to-host-a-minecraft-server-for-free-game-hack, which is presented as a 'free generator / game hack'. The document body also contains a call-to-action phrase 'CLICK HERE TO ACCESS MINECRAFT GENERATOR' and another suspicious URL. These elements indicate a phishing or social engineering attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier clean score 0.0794

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/479516143/how-to-host-a-minecraft-server-for-free-game-hack In PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/how-to-get-free-robux-on-phone_GM431946152.pdfIn 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_off00002395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2395 21380 bytes
SHA-256: d0abd7068f83834f1d85e906936c1fb658ff2f2ac17fdf5189fbd877cd2c99ba
font_01_sfnt_off000051a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51A4 17988 bytes
SHA-256: 552c8aaf5f0bf5f0c44469b5bd19d93c548c2f36967da1a6f1157fed71bc8ec1

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