Malicious PDF — malware analysis report

Static analysis result for SHA-256 1638de585cfaafa4…

MALICIOUS

PDF

26.5 KB Created: 2021-06-19 06:36:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: db1687be37c1035c04afdeb4dbcaf8e2 SHA-1: b6b2a7403694655789cd54a1d43c9d633af5ef07 SHA-256: 1638de585cfaafa4688b570e9e8109d561a39f95b10cd27e005e6637284f66c1
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for a 'game hack' and a prominent 'CLICK HERE TO ACCESS' call to action, which is associated with malicious redirector infrastructure. The embedded URL directs to a known malicious domain, likely serving as a gateway to further malicious content or malware.

Machine Learning

  • Nyx PDF Classifier clean score 0.0372

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.co/app/406889139/free-role-in-coin-master-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_off000015ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AD 22144 bytes
SHA-256: 07884854478d2278196fceec7dd70b5142f4ad02101f53c6e1fd7ca031c4d574
font_01_sfnt_off000046b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x46B5 18072 bytes
SHA-256: b51d2cd8f3a2b2ab778bd1d4ef698f8fe12f93fad8d5b53ad600fdb8a6c5eb0e

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