Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb19afb96d791c14…

MALICIOUS

PDF

36.3 KB Created: 2021-05-21 22:13:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e825cac83ba542488d0aeef5939d5f5d SHA-1: 1e13d1c5744d5ee568be3fc6e61594f83f440a74 SHA-256: bb19afb96d791c1486fb480d21507b0ef8c315c9e1ebd5c6b2b41d717f40698f
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically promoting 'free Robux' generators with no human verification. The document body and heuristics indicate a lure to a scam website, likely designed to phish for credentials or deliver a secondary payload. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3758

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/how-to-get-free-robux-no-human-verification-2021-game-hack In PDF document text
    • http://www.eaapiaria.es/images/free-roblox-clothes-for-your-avatar_GM431946152.pdfIn PDF document text
    • http://www.eaapiaria.es/images/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://www.eaapiaria.es/images/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.eaapiaria.es/images/coin-master-hacks-2021_GM406889139.pdfIn PDF document text
    • http://www.eaapiaria.es/images/free-robux-link_GM431946152.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_off00003017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3017 24792 bytes
SHA-256: 1566e34a1079083812197eb26fc4c97d1562994ccab4fbfb6f4bc506009e7238
font_01_sfnt_off0000693e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x693E 19428 bytes
SHA-256: dc7c459a90b1a398d2ee51f52972ed8a07904c77cd045887558a99bdb9823e3c

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