Malicious PDF — malware analysis report

Static analysis result for SHA-256 eab0c5cd419ae5c3…

MALICIOUS

PDF

34.7 KB Created: 2021-07-03 21:48:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 91357b9ee2f2ad5c2598a89ef970cc2f SHA-1: 6d8961ef07ce64da55ff7bd88096f91e93a6d94d SHA-256: eab0c5cd419ae5c36d7f3bf32f68ed09950a283d5755f79b78ffca319ec31b02
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/479516143/minecraft-gun-mod-download-free-game-hack PDF link annotation
    • http://katalog.gemalibrary.net/repository/roblox-robux-generator_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/games-for-robux_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/hack-coin-master-for-android_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-free-spins-usa-2021_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-hack-pc-download_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-to-cheat-in-roblox-mazes_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/hack-in-roblox-jailbreak-speed_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/clients-minecraft_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-to-o-get-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-outfits-for-roblox_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/roblox-free-accessories_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-robux-generator_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-hack-app-download-free_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-to-get-free-robux-without-email_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_off00003160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3160 22728 bytes
SHA-256: ecf7c90a1349ec86fe9b5f4df38560d84418f22409df89d1de82f383a3875cae
font_01_sfnt_off0000639c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x639C 18720 bytes
SHA-256: c40eb1edf819727d779fcdd46a1a495425ff69d655ae06a101e79a8dd4ff089a

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