Malicious PDF — malware analysis report

Static analysis result for SHA-256 879f850dd43c24af…

MALICIOUS

PDF

36.6 KB Created: 2021-05-10 11:05:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: cd95ec0ff66051e97af7588717658f29 SHA-1: 12ec091bb3c8dd257651fa499d303935d3932560 SHA-256: 879f850dd43c24afd276d56bc2947549ae3cde1fd6b005ec066ad93ec6088821
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for a malicious redirector link, specifically advertising a "free generator / game hack" for Coin Master. This link directs to the URL https://netcdn.xyz/app/406889139/easy-free-spins-coin-master-game-hack, which is flagged as malicious. The document body also contains similar text and the embedded URL, reinforcing the lure. While no scripts were extracted, the primary function appears to be directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier clean score 0.0312

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/406889139/easy-free-spins-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
stream_003_off0000351e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x351E 25496 bytes
SHA-256: db300656942e754f6423f29850b2c4949fa066bc1b11be230e1c1f18e59e7350
font_01_sfnt_off00006e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E68 18068 bytes
SHA-256: 2b5bcb60036e8604cee537a76a0c1d845177aa2c28f1eb7ce8b27015c89bb61f