Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d288acf1e2353e…

MALICIOUS

PDF

34.2 KB Created: 2021-07-04 04:40:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: ec320684c5e6938c3dbf375e2bfb9ca2 SHA-1: dafd187a3654d0e02ee38b7fd37f48b052206ae8 SHA-256: 19d288acf1e2353eca02dad26c07e78b125de2f211ab6eabbd3472d5c449d208
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/coin-master-free-pet-snacks-game-hack PDF link annotation
    • https://zarco.co.in/uploaded_files/userfiles/files/best-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/minecraft-pe-hacks-ios_GM479516143.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/to-get-robux-for-free_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/how-to-bypass-cheat-engine-on-roblox_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/coin-master-free-spins-youthnow_GM406889139.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/how-to-play-coin-master_GM406889139.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/how-to-use-hacks-in-roblox_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/cheat-engine-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/roblox-bgs-hacks_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/instan-kill-boss-hack-script-dungeon-quest-roblox_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/free-robux-please_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/codes-for-adopt-me-roblox-for-free-money-2021_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/how-to-get-free-robux-on-mobile-easy_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/coin-master-daily-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/how-do-you-earn-robux_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/roblox-free-robux-hack-youtube_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/free-robux-no-verification-required_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_off00002ffb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FFB 22788 bytes
SHA-256: 65dba26c8c3fa1ab968a364e3aee161bd8abbd8619e372db81c7ed619d46a329
font_01_sfnt_off000062f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62F0 18320 bytes
SHA-256: 70b721ff8e84e5e3b63fc5a4a42e5159d74764d5659d2c470f477e43d1d853e9

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