Malicious PDF — malware analysis report

Static analysis result for SHA-256 f629ec7a28b74b76…

MALICIOUS

PDF

37.4 KB Created: 2021-05-22 18:36:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 441a4eea19cf514bc0d9eadf1eb1bd38 SHA-1: ca9109930830dd4bfce2f4e3d92943b501ed19dd SHA-256: f629ec7a28b74b76dcdfc148d71fde33693077f2c6105a4f871d1a4dad37afa2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to a 'free generator' or 'game hack' lure, aiming to trick users into downloading potentially malicious files. The ML classifier also flagged this PDF as malicious. While no scripts were directly extracted, the embedded URLs and the nature of the lure suggest a phishing or malware distribution attempt.

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-cards-game-hack In PDF document text
    • https://www.efeskbb.com/upload/content/files/robux-online_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/coin-master-hacks-for-android_GM406889139.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/free-robux-ad_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/coin-master-hack-apk-2021-download_GM406889139.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
stream_002_off00003232.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3232 27392 bytes
SHA-256: 9bcf8059275011cea797cd910a6ccd625d3837906e10cd3de9e771cbcc71f514
font_01_sfnt_off0000707f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x707F 18416 bytes
SHA-256: 79c56a0f23d4fc34690a575a065be14b64911c3c5a3331038291264b4b7107af

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