Malicious PDF — malware analysis report

Static analysis result for SHA-256 1913d1779f5e9ee6…

MALICIOUS

PDF

34.1 KB Created: 2021-07-06 09:45:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 63d6f77b3fe666e7889f542ed2894252 SHA-1: ab61d04de7b86f1ae9df3e86c023b50558ddd50f SHA-256: 1913d1779f5e9ee6654cba8823bd05274c069e649f86812745fd0aa3366472cf
182 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. It uses a password-protected-archive lure. 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 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.tw/app/406889139/coinmasterdailyfreespins-com-game-hack PDF link annotation
    • http://lib.uho.ac.id/library/repository/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-spins-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-change-your-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-online-without-human-verification_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-gratis_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-free-catalog-items-in-roblox-no-copy_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-no-password_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/hacks-for-booga-booga-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/kachifpro_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/best-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-robux-com_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-spins-on-coin-master-cheat_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-snacks-link_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-make-a-modded-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-stuff-that-cost-coins-free-mcpe-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-free-things-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/can-i-hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/hack-roblox-plusieur-onglet_GM431946152.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_off000030d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30D7 21996 bytes
SHA-256: eb0703a6892e2cd3a223d35513f8b09d7fb3a1248d97472980d54fdb54c44989
font_01_sfnt_off0000616c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x616C 18696 bytes
SHA-256: ce456eb17f2db1915b327d416d1e6d0ed8e1fdec420ac0cee82ca000bfaa5c3f

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