Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1de339163cedf3…

MALICIOUS

PDF

50.1 KB Created: 2021-06-03 10:06:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 5110c64b5ece17ddb020e51b025372f4 SHA-1: 4c6402d9096b6c52f43c9cd7388eb38ed5be4bc8 SHA-256: 8b1de339163cedf392718659942b74031ac647c6900e042f196a5f9d9435b054
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 0.9734

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/free-robux-come-game-hack PDF link annotation
    • http://pustakasma.nurulfikri.sch.id/repository/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/coin-master-pet-food-free_GM406889139.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/coin-master-game-hack-link_GM406889139.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/coin-master-hack-uk_GM406889139.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/coin-master-70-spin-link-today_GM406889139.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/coin-master-gold-cards-free-2021_GM406889139.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/hackear-coin-master-espaol_GM406889139.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/working-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/robux-free-robux_GM431946152.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/how-to-get-free-robux-without-surveys_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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F11 26360 bytes
SHA-256: 1615b70ab0451ad05b16b37b4767b22530ca79d0bc74c57f096f4722c4017259
font_01_sfnt_off00008cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CDB 2912 bytes
SHA-256: fa76cc2dab30b56d5305de71ce949b6adffd6580af2f26905a33966a3200adbb
font_02_sfnt_off000096cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96CC 2816 bytes
SHA-256: 4555740682277f0055d57b15bd0ba953e5b51415ea3d21c93db391eace072d4f
font_03_sfnt_off0000a0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA0DD 18276 bytes
SHA-256: d7491fe45cc88596c87233a963b6162720bf27c142cea717df16fbc09fa29ea6

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