Malicious PDF — malware analysis report

Static analysis result for SHA-256 871bd5dac9e2fd90…

MALICIOUS

PDF

37.7 KB Created: 2021-05-22 23:13:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ad3baca78fa7c52acc9d65682f1daefc SHA-1: d0a2235bac656151d3e471be231ca74b80a4f474 SHA-256: 871bd5dac9e2fd904a5c65323995fd277d16ce1e3fe7bb09884c13d05d88a8f9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to malicious redirectors, specifically advertising 'free Robux' and 'game hacks' to entice users. The primary malicious URL identified is https://netcdn.xyz/app/431946152/free-robux-discord-game-hack. The document body and embedded links suggest a phishing or scam attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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/431946152/free-robux-discord-game-hack In PDF document text
    • http://www.duchidicastelluccio.it/images/coin-master-hack-ios-reddit_GM406889139.pdfIn PDF document text
    • http://www.duchidicastelluccio.it/images/roblox-avatar-girl_GM431946152.pdfIn PDF document text
    • http://www.duchidicastelluccio.it/images/spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://www.duchidicastelluccio.it/images/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.duchidicastelluccio.it/images/pubg-uc-jarir_GM1330123889.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3587 26760 bytes
SHA-256: f9550a29e72c5c192de9271132ea5d02c78007c8013d8597f4bd4e7998a9434c
font_01_sfnt_off00007195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7195 18476 bytes
SHA-256: bd0365f7f2eefd731cbfcd90ede0e91cb43578b4b980f4195e4871e1034addc2

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