Malicious PDF — malware analysis report

Static analysis result for SHA-256 efbfeb8bd7498f37…

MALICIOUS

PDF

37.3 KB Created: 2021-05-21 02:52:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 2be5315871eb8d841d97f6356a43da69 SHA-1: 56a3f7bf430bf153cf427e94a69e736cd95aeb3e SHA-256: efbfeb8bd7498f374436405975d19aaf59aa633c3094a35d261fe3cfac7f4e85
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites, including one identified as a malicious redirector. The document body text and heuristics indicate a lure for 'game hacks' or 'generators', suggesting an attempt to trick users into downloading further malware. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

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/479516143/how-to-play-minecraft-for-free-on-pc-game-hack In PDF document text
    • https://miraller.com/upload/files/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • https://miraller.com/upload/files/rewards-robux_GM431946152.pdfIn PDF document text
    • https://miraller.com/upload/files/minecraft-pocket-edition-apk-free-download_GM479516143.pdfIn PDF document text
    • https://miraller.com/upload/files/coin-master-hack-programers_GM406889139.pdfIn PDF document text
    • https://miraller.com/upload/files/claim-free-robux-button_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
stream_002_off000037c0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37C0 25040 bytes
SHA-256: d2acc118e9cad1e7b7dd7499d466b9dcf7eebe54708e32acd78fd5f95a189177
font_01_sfnt_off00007095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7095 18284 bytes
SHA-256: 805db6617afe2d237489c8bb7c2b5cc2832d34670fdae12a8b82fd0acde92e0c

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