Malicious PDF — malware analysis report

Static analysis result for SHA-256 2649c5ec20293dfc…

MALICIOUS

PDF

47.2 KB Created: 2021-06-02 10:55:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 1e180ba71896c30719d64652e94390ee SHA-1: 95e5fc6680cb9a347b8fbfd467fd2cfbe3555aa1 SHA-256: 2649c5ec20293dfc25857bbf8ca391fe5d5f2722f24f3729b6cf42f5176b2daa
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains numerous links to external websites, many of which are related to game hacks and 'free Robux' generators. The presence of a 'free generator / game hack' lure and an MFA harvesting lure suggests a phishing attempt aimed at stealing user credentials or session tokens. The document's structure and the high number of outbound links indicate it functions as a link farm designed to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 6

  • 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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/431946152/robuxian-com-free-robux-code-generator-game-hack PDF link annotation
    • http://sbm-nn.ru/images/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/rbx-claim_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-hack-online-android_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-minecraft-for-free-on-tablet_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/microsoft-rewards-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-minecraft-for-free-on-ps4-2021_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/hack-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-free-spin-and-trading_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-free-spins-link-today-instagram_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-robux-link_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/minecraft-pe-apk_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050ab.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50AB 25624 bytes
SHA-256: 3060818f3a44f87fdc69864b708d8416ece673938fc5ad7b9f51af62bc91ba5f
font_01_sfnt_off00008a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A50 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off000093ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93FF 18900 bytes
SHA-256: 082204f8b5fa547c955b8d0b2d12e0a6236048c9323b0fa48f5d493dc607dbca

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