Malicious PDF — malware analysis report

Static analysis result for SHA-256 02c87741bbe4e745…

MALICIOUS

PDF

34.2 KB Created: 2021-07-06 06:54:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 018dbcf3852e40e63eb3fc252316b521 SHA-1: a6a3da7e236e3598c7e5ccb8fdc6c8b0bd948a3e SHA-256: 02c87741bbe4e7455ad79066092eabc3095d539a8d94b52843178b91ce9d8d6c
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.tw/app/406889139/collect-free-spins-for-coin-master-game-hack PDF link annotation
    • http://perpustakaan.pa-dompu.go.id/repository/how-to-get-free-robux-in-roblox-2021-iphone_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id/repository/get-free-robux-add-codes_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id/repository/how-to-play-any-roblox-game-for-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id//repository/roblox-free-hats_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id/repository/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id/repository/robux-gift-card-2021-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id//repository/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id/repository/ame-kit-how-to-earn-your-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id/repository/free-dominus-userscripts-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id/repository/only-working-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id/repository/2021-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id/repository/get-robux-today_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id/repository/roblox-hack-launcher_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id/repository/is-there-an-actual-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id/repository/how-to-get-free-robux-on-roblox-on-a-phone_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id/repository/how-to-get-free-coins-in-assassin-roblox-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id/repository/roblox-how-to-use-cheat-engine-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id/repository/pokemon-go-free-promo-code_GM1094591345.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id/repository/roblox-free-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id/repository/hack-scripting-in-roblox_GM431946152.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_002_off00002fd3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FD3 22852 bytes
SHA-256: f0160b23107c556655e4eaae6b7dcca12e10f96e208dfbd4d7af7e01e8affc17
font_01_sfnt_off0000631f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x631F 18248 bytes
SHA-256: bb7de50ef59c2fb20db53529cc2c7c2498890c70cfa5b396a93a55e52229accf

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