Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ba6a0b87bf7c196…

MALICIOUS

PDF

33.8 KB Created: 2021-07-01 09:34:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 9c991e641d89e2e1a287912dcfe1fdf9 SHA-1: e24ac5f5a2cad6c2a7babd856bd4ebcffc448b4a SHA-256: 9ba6a0b87bf7c1966cf86e24a44ffe153990ab968bea5160e3fe7294c93e60b8
260 Risk Score

Malware Insights

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

The PDF contains numerous links designed to lure users with promises of free game items and currency, such as 'free working Robux codes'. One critical heuristic identified a link to a known malicious redirector at http://netcdn.co/app/431946152/free-working-robux-codes-game-hack. Another heuristic indicates a large number of external PDF links, suggesting a link farm used for SEO manipulation or distributing further malicious content. The presence of a fake CAPTCHA heuristic further supports the malicious intent, aiming to trick users into executing commands or interacting with the document in unintended ways.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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
  • 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-working-robux-codes-game-hack In PDF document text
    • http://www.peterbarsony.com/userfiles/files/coin-master-free-spins-link-fb_GM406889139.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/how-do-you-get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/gamehunters-coin-master_GM406889139.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/minecraft-bedrock-free-download-pc_GM479516143.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/how-to-hack-a-friend-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/free-robux-no-waiting_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/free-views-on-tiktok_GM835599320.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/is-minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/robux-hack-youtubecom_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/coin-master-free-cards-link-2021-today_GM406889139.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/cool-items-roblox-free-and-how-to-get-them_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/cheat-codes-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/can-you-hack-using-developer-console-roblox_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/roblox-hack-cheat-engine-67_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/free-roblox-accounts-2021_GM431946152.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_off00002e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E07 21748 bytes
SHA-256: dc1287e743a6831f10b9a27639cbcc3b20979cf6698f8bd37f1e40ec2ddf6068
font_01_sfnt_off00005df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DF6 19380 bytes
SHA-256: 11f845e8e2c6e944c6b1aabe2018263654bf18326ecc60811450bba544f57f3d

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