Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc85417a57446df7…

MALICIOUS

PDF

33.5 KB Created: 2021-07-03 22:36:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 98458d17684b917bc9af9fa646ed652a SHA-1: 034f65c9bb6c5322a711af955d1d824e80289a8b SHA-256: dc85417a57446df72905b52734101da282eac0c8fcc57336513f9bfef956f4e5
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/free-minecraft-games-for-kids-game-hack PDF link annotation
    • http://katalog.gemalibrary.net/repository/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-online-free-spin_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/hacks-to-walk-through-walls-on-roblox_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/minecraft-games-online-free-no-download_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-robux-generator-not-a-scam_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/roblox-jailbreak-hack-script-download_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/master-game_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-robux-exe_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/do-you-get-free-robux-with-builders-club-2021_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/roblox-money-cheats-2021_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/robux-sites_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/impact-roblox-hack-website_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/hack-roblox-pin-cod_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-spins-and-coins-com_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-free-spins-app_GM406889139.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_off0000301f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x301F 21868 bytes
SHA-256: 4e25d20e4ea849276b7110f5ed1de99437384c633275436ee450f6434044b682
font_01_sfnt_off00005ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF7 18432 bytes
SHA-256: fce0cee9bb026e9b658c5a6be084441bf5d333caf380f9a351f6fa516673a190

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