Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd0eb604db8448c…

MALICIOUS

PDF

46.3 KB Created: 2021-06-08 21:13:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 708d7e05c1b0842ac5ece77b43638632 SHA-1: 480c78e6f688969fbd5a280352ac2a9d985d4dfa SHA-256: bdd0eb604db8448c8d5c5b641e9d427f32c8f5ada830e0aabc5ae6114c746c4c
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 0.9832

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.tw/app/431946152/how-to-get-a-free-bugatti-in-roblox-jailbreak-game-hack PDF link annotation
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/cheat-engine-64-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/roblox-cheat-guide_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/how-to-cheat-roblox-tycoons_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/promocode-on-libery-free-stuff-roblox_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/minecraft-realms-free-codes_GM479516143.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/free-accessories-in-roblox-codes_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/hack-menu-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/rolox-free-robux_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/feburary-22-btools-hack-roblox_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/free-robux-hack-generator-2021-that-i-can-download_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/someone-has-hacked-into-my-roblox-account_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/how-to-be-a-free-admin-on-roblox_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/get-tiktok-followers-free_GM835599320.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/roblox-skywars-infinite-wins-hack_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/abs-roblox-t-shirt-free_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_off00005470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5470 25476 bytes
SHA-256: 2b076fe1184d446e31786223a6a72b4c5527a91a0dd57f223a22c27c7441f845
font_01_sfnt_off00008f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F64 19328 bytes
SHA-256: 2783876c89562722bf9e7985326ad8d2a493873b0d338cb63c91cb6fc431d27a

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