Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cbfb749a659d6f6…

MALICIOUS

PDF

34.5 KB Created: 2021-06-25 20:21:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c1954821044ff07a2b3fab4ad7cf969d SHA-1: 2586e12c448dee75c5355a870d6c2caf3220f7e0 SHA-256: 3cbfb749a659d6f6ad172118b689dbb9fb392857c5474c0ee3777adc3c2fee4e
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.co/app/431946152/free-robux-hack-2021-glitch-game-hack PDF link annotation
    • http://schrichte.de/images/videos-de-como-ser-hacker-en-roblox-2021_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/twitter-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://schrichte.de/images/roblox-login-hack_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/roblox-dungeon-quest-free-stats-reset_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/roblox-free-hats-and-gear_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/free-roblox-headphones-catalog_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/how-to-hack-granny-in-roblox_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/hack-matar-gente-roblox_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/how-does-a-roblox-account-get-hacked_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/coin-master-hack-tuts_GM406889139.pdfIn PDF document text
    • http://schrichte.de/images/passengers-in-free-roam-in-flight-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/roblox-best-free-outfits_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/earn-robux-sites_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/robux-promo-codes-free_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/how-to-get-free-roblox-in-2021_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/how-to-get-clothes-for-free-in-roblox_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/how-to-execute-code-with-cheat-engine-on-roblox_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/coin-master-free-gold_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
font_00_sfnt_off00002fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FB9 21884 bytes
SHA-256: 8fede6cf93f2a389961a740252c4ea68bb199e062ac82fbdbf450e8dda8a7fbf
font_01_sfnt_off00005ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF5 19752 bytes
SHA-256: b7d6255dfda39f563b1121ffde673d7f8410a12aefa9847ba3ef230a408527c7

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