Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6526b65faf83d5e…

MALICIOUS

PDF

47.3 KB Created: 2021-06-04 03:21:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 99d85255683fde022c34874fa48f1840 SHA-1: 99ddde246d626b4c936de93053fa996a49062bed SHA-256: b6526b65faf83d5e1165c357fd47e62694997fc8a504cf09951b096eb0109c14
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 0.9769

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-pin-codes-game-hack PDF link annotation
    • http://digilib.unla.ac.id/repository/free-spin-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/free-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/how-to-get-free-tokens-in-minecraft-ps4_GM479516143.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/how-to-get-a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-daily-free-rewards_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/free-spins-coin-master-links-app_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-spin-link_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/roblox-hack-app_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/roblox-hack-me_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/how-to-create-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/tiktok-free-folowers-75_GM835599320.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-free-spins-fb_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/roblox-free-items_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/roblox-report-hacker_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000508e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x508E 25064 bytes
SHA-256: c78ebc3da29542e16d46be2c1dad8fddb2c4ad1d1b67ef4ca0953dff824ee428
font_01_sfnt_off00008a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A20 3280 bytes
SHA-256: 98c8494c780bd0f7d9af1bf84fbea4b3707a6e7a8a8ca7c5c5eb1a4e5d958292
font_02_sfnt_off00009592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9592 18464 bytes
SHA-256: 23872266a6577b01853888d52c04c526ac323517b7f86f8cb64f3b9e81653507

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