Malicious PDF — malware analysis report

Static analysis result for SHA-256 13d2cde746e04dbe…

MALICIOUS

PDF

44.3 KB Created: 2021-06-11 08:02:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: bd0c966e7a6499c559a15c19d73c2417 SHA-1: 29b5dd23019c87491dd4cc9ade7994372ed04ea3 SHA-256: 13d2cde746e04dbef352a0c0a1752567561b3515ca8a7c3f3e43fa53b7e8a486
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 0.9865

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/free-tix-roblox-pbb-game-hack PDF link annotation
    • https://lesegais.ru/images/rich-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://lesegais.ru/images/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://lesegais.ru/images/how-to-get-minecraft-for-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • https://lesegais.ru/images/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://lesegais.ru/images/coins-master-hacks_GM406889139.pdfIn PDF document text
    • https://lesegais.ru/images/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://lesegais.ru/images/how-to-get-free-admin-in-all-roblox-games_GM431946152.pdfIn PDF document text
    • https://lesegais.ru/images/coin-master-pc-hack-download_GM406889139.pdfIn PDF document text
    • https://lesegais.ru/images/coin-master-35-2-hack_GM406889139.pdfIn PDF document text
    • https://lesegais.ru/images/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • https://lesegais.ru/images/como-hackear-coin-master-2021-espaol_GM406889139.pdfIn PDF document text
    • https://lesegais.ru/images/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://lesegais.ru/images/script-to-roblox-free_GM431946152.pdfIn PDF document text
    • https://lesegais.ru/images/how-to-get-free-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • https://lesegais.ru/images/best-free-hacked-client_GM479516143.pdfIn PDF document text
    • https://lesegais.ru/images/free-roblox-accounts-2021-june_GM431946152.pdfIn PDF document text
    • https://lesegais.ru/images/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • https://lesegais.ru/images/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • https://lesegais.ru/images/download-a-free-generator-for-robux-no-website_GM431946152.pdfIn PDF document text
    • https://lesegais.ru/images/coin-master-hack-unlimited-spins_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_004_off00004fc8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FC8 25640 bytes
SHA-256: b91af01313729b96f6c0d216c6ce1d8b9595540d3aafbd40624ec31b678a5db3
font_01_sfnt_off00008b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B07 18220 bytes
SHA-256: 732ecbdd09954221bd618bc5162581ec47f7bf6721bc60f6a9ff3fd66142ccaa

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