Malicious PDF — malware analysis report

Static analysis result for SHA-256 17257f32d2bdae61…

MALICIOUS

PDF

41.0 KB Created: 2021-05-16 02:32:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0d437bb2aea31e8d5ea71e31e7887845 SHA-1: 6f2e1f15bd383db3f004009c9dedcfc9df3b4945 SHA-256: 17257f32d2bdae61fd81a3434a05d28a7e54241eeb8939885ea78ea5dd7ea767
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 0.9971

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.xyz/app/406889139/free-coin-master-link-2021-game-hack PDF link annotation
    • http://halitbayramoglu.com.tr/images/rbx-website_GM431946152.pdfIn PDF document text
    • http://halitbayramoglu.com.tr/images/coin-master-hack-ios-jailbreak_GM406889139.pdfIn PDF document text
    • http://halitbayramoglu.com.tr/images/how-to-earn-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://halitbayramoglu.com.tr/images/update-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://halitbayramoglu.com.tr/images/static-moonactive-net-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://halitbayramoglu.com.tr/images/daily-free-spin-link-in-coin-master_GM406889139.pdfIn PDF document text
    • http://halitbayramoglu.com.tr/images/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • http://halitbayramoglu.com.tr/images/how-to-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://halitbayramoglu.com.tr/images/coin-master-hack-twitter_GM406889139.pdfIn PDF document text
    • http://halitbayramoglu.com.tr/images/roblox-skin-free_GM431946152.pdfIn PDF document text
    • http://halitbayramoglu.com.tr/images/how-you-get-robux_GM431946152.pdfIn PDF document text
    • http://halitbayramoglu.com.tr/images/best-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://halitbayramoglu.com.tr/images/card-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://halitbayramoglu.com.tr/images/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • http://halitbayramoglu.com.tr/images/how-to-get-free-gamepasses-on-roblox_GM431946152.pdfIn PDF document text
    • http://halitbayramoglu.com.tr/images/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://halitbayramoglu.com.tr/images/haktutsin-2021-09-coinmaster50freespinandcoinlinkhtml-m-1_GM406889139.pdfIn PDF document text
    • http://halitbayramoglu.com.tr/images/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://halitbayramoglu.com.tr/images/free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://halitbayramoglu.com.tr/images/coin-master-spin-link-today_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
stream_003_off0000460d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x460D 24440 bytes
SHA-256: 861d9dbdde00019611decd05fd3dc6a8c1d4d525cc3a444a8549fe0098190dda
font_01_sfnt_off00007dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DBA 18284 bytes
SHA-256: 15cbb039240871f663533138b429172a54e714a7a81015087603783b9c5e24ba

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