Malicious PDF — malware analysis report

Static analysis result for SHA-256 42db6ac6a1e4942f…

MALICIOUS

PDF

36.1 KB Created: 2021-05-21 16:20:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 8fa079ef302e73a74b841bb5ddb30d77 SHA-1: 3b13d6b576c1c608bbb448859a6a8b56107f35fc SHA-256: 42db6ac6a1e4942f415db11441ea6bca66d2e2a9f8c246036e0f20ddb9aaa786
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically promoting 'free Robux' or 'game hacks' to entice users. The document body and embedded links strongly suggest a social engineering lure designed to lead victims to potentially harmful websites. While no scripts were directly extracted, the PDF structure and embedded links indicate a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

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-on-phone-game-hack In PDF document text
    • http://dopheide.be/images/easy-robux-today_GM431946152.pdfIn PDF document text
    • http://dopheide.be/images/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://dopheide.be/images/coin-master-hack-ios-no-human-verification_GM406889139.pdfIn PDF document text
    • http://dopheide.be/images/coin-master-hacks-for-iphone_GM406889139.pdfIn PDF document text
    • http://dopheide.be/images/free-robux-picture_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_off00003284.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3284 24980 bytes
SHA-256: f3ab95d64eb54e8ebb7b342a9af762bc4cbe9ff8eaabc48665abff65883ba1ea
font_01_sfnt_off00006ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AE5 18600 bytes
SHA-256: 4aaa4dd608c1f398ea3b3714e579938e54c8b6ebc42d5b365d603cdfd05c4e85

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