Malicious PDF — malware analysis report

Static analysis result for SHA-256 17e7919feb04e959…

MALICIOUS

PDF

35.0 KB Created: 2021-07-05 21:00:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: d8852e6b4a27eef7b4a142d9d5e25994 SHA-1: 766560123a0348461a3ee689406dc56978a1763d SHA-256: 17e7919feb04e959331af1e0cb10dfa602fa4b886af0f940c8d3ad4acb6267c7
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/431946152/free-robux-codes-2021-game-hack PDF link annotation
    • http://mtsn-baranti.com/perpus/repository/free-promo-code-for-2-million-robux_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/free-way-to-get-robux-by-using-inspect-and-edithtml_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/roblox-bit-slicer-speed-hack_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/free-shirts-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/how-ro-hack-roblox-account_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/how-to-get-free-robux-on-computer-website_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/roblox-hack-sites-2021_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/lots-of-robux_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/free-robux-giveaway-every-hour_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/robux-infinite-free_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/roblox-free-asset_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/como-jugar-roblox-free_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/free-minecraft-printables_GM479516143.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/how-to-make-your-own-minecraft-server-for-free_GM479516143.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_off00002f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F0E 23108 bytes
SHA-256: 76b0ba0a833207c8c37d44b74b21b315852d981e15f1bb26166d0ebca0d67329
font_01_sfnt_off00006315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6315 19292 bytes
SHA-256: a06e109f4742255b3e3bb25118cfd4c6c94882922bdfaa475a115917b157a644

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