Malicious PDF — malware analysis report

Static analysis result for SHA-256 b95cfd144a780015…

MALICIOUS

PDF

33.8 KB Created: 2021-07-06 02:22:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 12133c6e2565875a213b69b057170e34 SHA-1: d5a9acb78d2d5833a3c9e3e8b27ee01315eccd09 SHA-256: b95cfd144a780015497cdec53767cf41ddd475b33dbe0041d1e2b88598f369eb
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/www-coin-master-hack-com-game-hack PDF link annotation
    • http://lib.mappifhui.org/repository/free-roblox-accounts-with-robux-v3rmillion_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/best-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-fan-page-giveaway_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/roblox-hack-tower-battles_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/where-tiktok-free-views-apk-download_GM835599320.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/tiroblox-cheats-for-robux-and-tix-robloxcheatsnet_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/how-to-be-a-free-admin-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/roblox-studio-free_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-hack-version-2021-free-download_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/free-robux-free-buying_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-free-spin-and-coin-link-2021-today_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/help-im-being-cheated-on-by-some-roblox-girls_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/get-everything-free-roblox-console-pastebin_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-free-food-for-pet_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/dominus-free-roblox_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/op-rewards-robux_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/free-robux-generator-2021-no-download_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
font_00_sfnt_off00002d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D0B 23032 bytes
SHA-256: b42e36eb177fe4d7f8dc671b288374617b1ff2fb840b539c79b935ef4604d726
font_01_sfnt_off0000601d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x601D 18628 bytes
SHA-256: 60fc02595c4fd4bdb4ac2d5fd29e74a312ca99cfa8da20533531767e60f20837

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