Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8552a1ef4271a93…

MALICIOUS

PDF

36.8 KB Created: 2021-05-22 01:42:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e241a80013508d7525dc846b7eac594b SHA-1: 24c4a5d2c709c127aacc5cec85d920f8e5c98900 SHA-256: e8552a1ef4271a932d752ade71cbe2cc9a701a7fe40d50a3aa02caf17033e517
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, specifically advertising a 'free generator / game hack'. The document body and embedded links reinforce this lure, directing users to URLs associated with such scams. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious websites, likely for phishing or malware distribution.

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/robux-free-2021-game-hack In PDF document text
    • https://www.transvision.id/ckfinder/userfiles/files/coin-master-online-free-spin_GM406889139.pdfIn PDF document text
    • https://www.transvision.id/ckfinder/userfiles/files/how-to-get-free-tiktok-likes_GM835599320.pdfIn PDF document text
    • https://www.transvision.id/ckfinder/userfiles/files/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • https://www.transvision.id/ckfinder/userfiles/files/earn-free-robux_GM431946152.pdfIn PDF document text
    • https://www.transvision.id/ckfinder/userfiles/files/free-spin-coin-master-online_GM406889139.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_off00003398.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3398 25404 bytes
SHA-256: bae297ec38ab19171ea1f2a591630f58316fe03c3b72933688d6f42a40fa2dde
font_01_sfnt_off00006de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE2 18416 bytes
SHA-256: 1a644f5289783458eb76ac5741ebd0afe9ba6d8f40911ca8ddb4573f3c6c1b2f

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