Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec8c709d43f15c01…

MALICIOUS

PDF

46.2 KB Created: 2021-06-03 16:13:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 8e45eaecf5517f2c9f3eca618244dfc7 SHA-1: 0ecd1f3108cc11a1264eb205aaacf4b8b46e4f0a SHA-256: ec8c709d43f15c0134629e1e1afc4f4f715619c3778cb39c89d54abd36a2f7a7
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 0.9864

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.online/app/431946152/how-do-you-get-free-robux-on-roblox-game-hack PDF link annotation
    • https://www.andrology.co.uk/uploads/files/files/play-full-version-of-minecraft-for-free-no-download_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-robux-glitch_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/is-minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-minecraft-server_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-hack-without-verification-site-zyngaplayerforumscom_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-hack-unlimited-spins_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/games-in-roblox-that-give-you-robux_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-robux-reddit_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-how-to-get-free-pet-food_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/best-free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-free-spins-link-facebook-page_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/is-minecraft-free-on-ps4_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-tiktok-followers-generator_GM835599320.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_off00005092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5092 28288 bytes
SHA-256: 07fdca0b0c218d33c682ac5f83b08afd998e71c31241bd1682bf1f9879561873
font_01_sfnt_off000090ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90CA 18688 bytes
SHA-256: 1a1edbb4620230d43f84097700922ea11c75fa5ad69815b80eb1b16329c7dce0