Malicious PDF — malware analysis report

Static analysis result for SHA-256 0be385181491e21b…

MALICIOUS

PDF

44.0 KB Created: 2021-05-20 01:01:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 3a86a6d855288070a133cf5e2879a020 SHA-1: 211c7ca199a0bc2af4b674d0dcd1b501a29dc304 SHA-256: 0be385181491e21bae7ae5e9d5eb8df11d581d3477d58a404b7a6b9bbda1e54c
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector domains and SEO-optimized PDF files, all related to "free Robux" or "game hacks". The primary redirector URL is https://netcdn.xyz/app/431946152/free-robux-images-game-hack, which is likely used to distribute further malicious content or phish for credentials. The presence of numerous links suggests a link farm designed to attract users searching for cheats or in-game currency.

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-robux-images-game-hack In PDF document text
    • http://www.en.indigo-imaging.com/Public/upload/editorfiles/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://www.en.indigo-imaging.com/Public/upload/editorfiles/how-do-you-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://www.en.indigo-imaging.com/Public/upload/editorfiles/coin-master-spin-hack-link_GM406889139.pdfIn PDF document text
    • http://www.en.indigo-imaging.com/Public/upload/editorfiles/minecraft-java-free-account_GM479516143.pdfIn PDF document text
    • http://www.en.indigo-imaging.com/Public/upload/editorfiles/coin-master-free-spin-trick_GM406889139.pdfIn PDF document text
    • http://www.en.indigo-imaging.com/Public/upload/editorfiles/blox-pink-robux-free_GM431946152.pdfIn PDF document text
    • http://www.en.indigo-imaging.com/Public/upload/editorfiles/coin-master-mod-apk-latest-hack-with-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • http://www.en.indigo-imaging.com/Public/upload/editorfiles/free-spin-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.en.indigo-imaging.com/Public/upload/editorfiles/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.en.indigo-imaging.com/Public/upload/editorfiles/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.en.indigo-imaging.com/Public/upload/editorfiles/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • http://www.en.indigo-imaging.com/Public/upload/editorfiles/coin-master-free-spins-link-31-march-2021_GM406889139.pdfIn PDF document text
    • http://www.en.indigo-imaging.com/Public/upload/editorfiles/how-to-download-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://www.en.indigo-imaging.com/Public/upload/editorfiles/coin-master-hack-pro_GM406889139.pdfIn PDF document text
    • http://www.en.indigo-imaging.com/Public/upload/editorfiles/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://www.en.indigo-imaging.com/Public/upload/editorfiles/coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.en.indigo-imaging.com/Public/upload/editorfiles/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • http://www.en.indigo-imaging.com/Public/upload/editorfiles/minecraft-free-online-games_GM479516143.pdfIn PDF document text
    • http://www.en.indigo-imaging.com/Public/upload/editorfiles/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • http://www.en.indigo-imaging.com/Public/upload/editorfiles/how-to-get-free-minecraft-coins_GM479516143.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_off00004d27.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D27 25712 bytes
SHA-256: 0ddc63c8715b6444a7530886414b465eeb79d7bc66106f5493aecb07c0cbb7e8
font_01_sfnt_off0000884d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x884D 18792 bytes
SHA-256: a2580c58451f3b1d88c8ceab1016c43f7244c9e681afad5968b7c22bbe0132ae

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