Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d70712caf5ba0da…

MALICIOUS

PDF

51.1 KB Created: 2021-06-03 09:50:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ef8d7364a3415a55428c46b994b46297 SHA-1: a9f82575c21538de0093d68f98d0114fbad3027c SHA-256: 0d70712caf5ba0dabc3f3b330b2d654481c656fc25d7485e56ce1530b44ac596
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9724

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/431946152/get-free-robux-now-game-hack PDF link annotation
    • http://rightlead.com.tw/image/data/files/free-spins-coin-master-cheats_GM406889139.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/minecraft-windows-10-free-with-java_GM479516143.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/coin-master-hack-tool-generator_GM406889139.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/free-robux-website_GM431946152.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/coin-master-hack-download-2021_GM406889139.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/coin-master-links-to-free-spins_GM406889139.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/coin-master-free-download-for-pc_GM406889139.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/is-minecraft-vr-free_GM479516143.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/free-old-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/minecraft-free-download-no-virus_GM479516143.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/hacks-for-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/coin-master-lucky-patcher-hack_GM406889139.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/coin-master-hacks-iphone_GM406889139.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/www-free-robux_GM431946152.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/coin-master-apk-hack-358_GM406889139.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/free-spins-coin-master-site-wwwquoracom_GM406889139.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/coin-master-hack-no-root_GM406889139.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/is-minecraft-free-on-pc_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5201 32652 bytes
SHA-256: 5ea83d9d4a8e65b9323baf7e5ea27ebd5e3b0f8085af511fb0910fe8d175ac10
font_01_sfnt_off00009867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9867 3656 bytes
SHA-256: 63a179d8a9645bea05c6d53b1776faf4e4a7281930de6cf484e639846bec2e20
font_02_sfnt_off0000a521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA521 18280 bytes
SHA-256: 538c9dd0db01d2f7ccbac1c4b1e59781ee6b2d24c7879b3cb67aab50807a8027

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