Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a58614c0ac6933…

MALICIOUS

PDF

45.7 KB Created: 2021-06-03 06:59:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 0361377118cd1da4bf98cbcf1583e1fe SHA-1: da4b441c3a17d3a80c1f15e4aacabb3ea1074f7d SHA-256: b9a58614c0ac6933519e0c3898d4ddc6e224252e66309744b8cd27911afc47d6
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure related to game hacks and free generators to entice users. It contains numerous embedded links, including a primary malicious redirector URL, and a large number of SEO-optimized PDF links hosted on nara.org.uk. The primary purpose appears to be directing users to malicious infrastructure, potentially for further exploitation or to serve as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.online/app/479516143/do-you-get-minecraft-windows-10-for-free-game-hack In PDF document text
    • https://www.nara.org.uk/uploads/files/files/coin-master-hack-mod-apk_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/how-to-get-more-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/coin-master-hack-september-2021_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/lucky-patcher-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/coin-master-free-spins-2021-generator_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/coin-master-free-attack-link_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/is-minecraft-free-on-pc_GM479516143.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/block-best-robux_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/free-spin-coin-master-today_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/minecraft-hacks-for-2b2t_GM479516143.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/www-roblox-robux_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/haktuts-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/coin-and-spin-link_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_004_off000054db.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54DB 25344 bytes
SHA-256: ca89f17d9beb2cc4219a91e7123c3c0bbdf984a5c370a408b650f8ed497cedbe
font_01_sfnt_off00008e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E0D 18996 bytes
SHA-256: 6efb8ecb4dc6f7e27f52b3317fae0c9f285348f122a83a6c92def46bb9593e98

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