Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bcb864719e65677…

MALICIOUS

PDF

35.5 KB Created: 2021-06-18 18:30:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 62e745a6573616215a8e8558e06e633b SHA-1: 4b299074e95ec9caadc693a68882d8b6c4a5bc68 SHA-256: 2bcb864719e65677d0dbc6e1248b15551c1d282ef8a321502f91246d2b551055
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on sbm-nn.ru and appear to be part of a link farm designed to attract users searching for game hacks and free in-game items like Robux and Coin Master spins. The primary lure is 'Free Robux With Rixty', directing to a netcdn.co URL. The presence of a 'PDF_SEO_LINK_FARM' heuristic indicates a high volume of outbound links, suggesting a malicious intent to redirect users to potentially harmful sites or facilitate further malware distribution.

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.co/app/431946152/free-robux-with-rixty-game-hack PDF link annotation
    • http://sbm-nn.ru/images/getrobux-info_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-gain-more-spins-on-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/can-you-really-hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/admin-roblox-free-download_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-a-free-face-on-roblox-mac_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/minecraft-pocket-edition-free-apk_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-free-spins--spins_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-robux-clothes_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-make-shirt-in-roblox-free_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/escape-are-51-roblox-how-to-free-the-dead-alien_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/earn-robux-today_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-domain-for-minecraft-server_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/rbuxcheats-club-roblox-hack_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-hack-apk-iphone_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_002_off000031ba.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31BA 22932 bytes
SHA-256: 78667bf28308738fe12c2983ec9328151fe3c5d57d56881fbc27092948a98811
font_01_sfnt_off0000652a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x652A 19300 bytes
SHA-256: d2bc5b0af88192273c9d224b5ce7ae7c1c62d86d4f50215fd341e2aa8bb6cde8

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