Malicious PDF — malware analysis report

Static analysis result for SHA-256 385242636423ebf7…

MALICIOUS

PDF

43.2 KB Created: 2021-05-13 15:05:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: d06e883917d6a3026aff5a1df7d50685 SHA-1: a5163557ffbec4f34a24009a6d6c8c10b39606d0 SHA-256: 385242636423ebf7eb03b5a4280c126a56df254c94d9d14c138eea21c4e98409
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users to external sites, including a known malicious redirector. The document body and heuristics indicate a scam related to game hacks and free currency, likely intended to lead users to phishing or malware download sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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-roblox-promo-codes-for-robux-game-hack In PDF document text
    • http://stikesprimaindonesia.ac.id/perpustakaan/repository/coin-master-400-spin-link-today_GM406889139.pdfIn PDF document text
    • http://stikesprimaindonesia.ac.id/perpustakaan/repository/free-spins-coin-master-2021-glitch_GM406889139.pdfIn PDF document text
    • http://stikesprimaindonesia.ac.id/perpustakaan/repository/hack-coin-master-apk-32_GM406889139.pdfIn PDF document text
    • http://stikesprimaindonesia.ac.id/perpustakaan/repository/coin-master-hack-2021-download_GM406889139.pdfIn PDF document text
    • http://stikesprimaindonesia.ac.id/perpustakaan/repository/coin-master-free-in-app-purchases_GM406889139.pdfIn PDF document text
    • http://stikesprimaindonesia.ac.id/perpustakaan/repository/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • http://stikesprimaindonesia.ac.id/perpustakaan/repository/free-roblox-groups_GM431946152.pdfIn PDF document text
    • http://stikesprimaindonesia.ac.id/perpustakaan/repository/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://stikesprimaindonesia.ac.id/perpustakaan/repository/coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://stikesprimaindonesia.ac.id/perpustakaan/repository/free-robux-now_GM431946152.pdfIn PDF document text
    • http://stikesprimaindonesia.ac.id/perpustakaan/repository/best-way-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://stikesprimaindonesia.ac.id/perpustakaan/repository/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://stikesprimaindonesia.ac.id/perpustakaan/repository/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • http://stikesprimaindonesia.ac.id/perpustakaan/repository/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://stikesprimaindonesia.ac.id/perpustakaan/repository/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://stikesprimaindonesia.ac.id/perpustakaan/repository/minecraft-story-mode-free-download_GM479516143.pdfIn PDF document text
    • http://stikesprimaindonesia.ac.id/perpustakaan/repository/free-robux-reddit_GM431946152.pdfIn PDF document text
    • http://stikesprimaindonesia.ac.id/perpustakaan/repository/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://stikesprimaindonesia.ac.id/perpustakaan/repository/free-roebucks-no-human-verification_GM431946152.pdfIn PDF document text
    • http://stikesprimaindonesia.ac.id/perpustakaan/repository/how-to-get-roblox-premium-for-free_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_003_off00004b80.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B80 25020 bytes
SHA-256: 807b857b839d5c8b5467094799a9581541c3bec1017ce03b8f3ee5bb859eb975
font_01_sfnt_off00008562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8562 18676 bytes
SHA-256: dfd02273a8a318689417f97410c8e56666a417a259e3d1ed1911a13d5d5a3d3c

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