Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1507a740118ad62…

MALICIOUS

PDF

35.0 KB Created: 2021-07-01 06:53:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0258963a561cbc66775ea1c9ead88372 SHA-1: da8af1602fa91cb4f698a87a637f5ad9486bc36b SHA-256: c1507a740118ad62f2445a96896c6c619285964a0ee10608222432756a278df0
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 0.9980

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 http://netcdn.co/app/431946152/roblox-bee-swarm-simulator-hack-game-hack PDF link annotation
    • https://mobile.connecttravel.com.tw/image/data/files/original-roblox_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/roblox-dragon-fury-hack_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/coin-master-free-spin-27_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/i-want-to-grow-my-account-tiktok-free_GM835599320.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/how-to-get-minecraft-bedrock-edition-for-free_GM479516143.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/how-to-donate-robux-for-free_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/pokemon-go-5-free-raid-pass_GM1094591345.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/minecraft-windows-10-free-code_GM479516143.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/coin-master-free-spin-bonus_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/how-to-get-robux-cards-for-free_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/free-roblox-admin-exploit_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/roblox-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/how-do-free-robux-games-have-roblox-admins_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/how-to-download-minecraft-for-free-on-your-phone_GM479516143.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000030d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30D2 22276 bytes
SHA-256: 8794decdbd6ce8082597e9db1a0a5a16c8920b5f1d140e965919732edad6208e
font_01_sfnt_off0000626d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x626D 19444 bytes
SHA-256: 026b2b593a9b8991d161b99ba1e37695c1f774d229bd2d07f43a3a3509d5a875

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