Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d497379453ed6c9…

MALICIOUS

PDF

32.9 KB Created: 2021-07-07 06:55:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5eb9f963cba161763116591ae1967f2d SHA-1: 18b5b57da78f91ab22a3ee7e7d01c645abd0b2a2 SHA-256: 7d497379453ed6c9d4d804ebe8bb4f7190e3bdd00322450f63c5cba02b71ab78
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 0.9824

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/431946152/robux-hacks-2021-game-hack PDF link annotation
    • http://www.bestbist.com/assets/uploads/pages/files/coin-master-free-cards-link-2021-today_GM406889139.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/can-you-get-robux-for-free-from-roblox-games_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/how-to-get-free-robux-inspect_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/how-to-get-20210-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/coin-master-apk-hack-32_GM406889139.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/atticus129-roblox-hacked-image_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/free-robux-pin-codes_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/rbxoffer-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/free-code-for-call-of-duty-ww2-roblox-pastebin_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/what-do-roblox-points-do_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/kachifpro_GM406889139.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/coin-master-hack-version-download_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_off000029e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29E4 22348 bytes
SHA-256: af20a7eb6fd5056f35e3058fe0662a8a2d3e87a32f80dcb23f797ac923c981bf
font_01_sfnt_off00005b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B68 19124 bytes
SHA-256: 5acc4cb5eca619de91ddb47cdc70e87d550a63f617f877071c9ac47b9f2637f1

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