Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f65152fa7866ad…

MALICIOUS

PDF

29.7 KB Created: 2021-07-18 23:15:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 88b779f0ff465dafba5a6d8d585dee20 SHA-1: 7f0f13685bcf7c903682cb34c5161313185facbe SHA-256: 15f65152fa7866adc91ae0ee0701b18d66088d8f108eb0d19a3d46f03d98d762
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors, specifically advertising a 'free Robux generator' which is a common lure for phishing and malware distribution. The document body text and heuristic firings confirm the presence of these malicious links, indicating an attempt to trick users into visiting harmful sites. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8523

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/431946152/blox-fish-free-robux-game-hack In PDF document text
    • http://xn-----clcdhzcbmgnochhb1boe1a6b.xn--p1ai/images/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://xn-----clcdhzcbmgnochhb1boe1a6b.xn--p1ai/images/how-to-get-a-free-minecraft-server_GM479516143.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_off000020ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20AD 22276 bytes
SHA-256: ea8c6cda1932defc3e3fbb53abfbd46cd45251c4e99953ade63e4bd28da947ec
font_01_sfnt_off000051a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51A0 18560 bytes
SHA-256: 725b9a1928db4b2668755c5edf7d3e0d0fb963dd4df088450304501d64e130ea

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