Malicious PDF — malware analysis report

Static analysis result for SHA-256 013987c9b9509e53…

MALICIOUS

PDF

34.7 KB Created: 2021-05-16 08:37:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6788c02e9707e9cef3026244c02ea848 SHA-1: b82a38ab0686d607e5d590310bd6beb652591878 SHA-256: 013987c9b9509e530e452d6ca2a852fd16065097f9b24c65309c446d5e89e96b
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, specifically a 'free generator / game hack' lure. The embedded URL, https://netcdn.xyz/app/406889139/how-to-get-free-coins-on-coin-master-hack-game-hack, is associated with malicious redirector infrastructure. The document body also contains similar text and a call-to-action, reinforcing the phishing and redirection attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.0306

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/how-to-get-free-coins-on-coin-master-hack-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_off000030d0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30D0 23868 bytes
SHA-256: 88f33b93f6485391aadc5883c2d9b80659f37577ec66e82d3f40bfecb9c5f3d1
font_01_sfnt_off00006712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6712 18044 bytes
SHA-256: 8c08c70171ded8116d72ec6b9f41602b425c47027f7aa83ef766cc7ef1375634