Malicious PDF — malware analysis report

Static analysis result for SHA-256 deda5d352fb205b1…

MALICIOUS

PDF

36.8 KB Created: 2021-05-23 07:06:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b96a4cc216786e05ca8087d2eb55060d SHA-1: 794ebdd1230df8856f03d9641d8c873a0d24ed52 SHA-256: deda5d352fb205b1b825f76adee13c0df0c16a4c8c07b47bc77a28c94848f700
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically a 'free Robux generator' lure. The ML classifier also flagged the PDF as malicious. While no scripts were extracted, the presence of malicious redirector links and the lure strongly suggest an attempt to lead the user to a malicious site, likely for credential harvesting or further malware delivery.

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-easy-game-hack In PDF document text
    • http://emilac.com/images/coin-master-free-link-blogspot_GM406889139.pdfIn PDF document text
    • http://emilac.com/images/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • http://emilac.com/images/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://emilac.com/images/hack-coin-master-free_GM406889139.pdfIn PDF document text
    • http://emilac.com/images/free-robux-no-human-verification-or-survey-2021_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_off00003373.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3373 25388 bytes
SHA-256: 1812f4ebc5c60c6ebc96b6525ad6f2d5b10d2a7da8957ceb6d2dae0f6f71c712
font_01_sfnt_off00006e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E25 18420 bytes
SHA-256: 93fb4fe90c413bceeeea5373daaca89ae05c83417e443247d622c1bd09cfd34e

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