Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f6ea8cce9311fc8…

MALICIOUS

PDF

30.4 KB Created: 2021-07-20 13:39:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f4563cf57d70cd3f172cf1948cb63da1 SHA-1: 823afbc9757daee286f10e80ec4d906e3ba6fbd7 SHA-256: 1f6ea8cce9311fc8c757bc1a37a2191f6371b713ad1c6a156c513fec839dcc41
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple links, including one pointing to a known malicious redirector infrastructure that promises a 'free Robux generator'. This lure is a common social engineering tactic to trick users into downloading malicious content or visiting phishing sites. The ML classifier also flagged this PDF as malicious, further supporting its suspicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8665

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/free-robux-generator-for-kids-game-hack In PDF document text
    • http://perpustakaan-pelita.sdnpercobaan2yogyakarta.com/repository/minecraft-bedrock-free-with-java_GM479516143.pdfIn PDF document text
    • http://perpustakaan-pelita.sdnpercobaan2yogyakarta.com/repository/coin-master-links-free-spins_GM406889139.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_off00002313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2313 22020 bytes
SHA-256: cf103d4ad0223dd0234187f35f5112d1211393021c3fda2e969a9283ae34aa6b
font_01_sfnt_off00005394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5394 18828 bytes
SHA-256: 4cbd0ae17372b8e997376decb208b799e75d96359c1fbbc6a9a72339bd757eb9

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