Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b3fa1a54035f83…

MALICIOUS

PDF

34.3 KB Created: 2021-07-06 03:11:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2db80288bc515aa47685d8923f63697c SHA-1: da647afb20a330e0d46761b97750fd2c9486239b SHA-256: 79b3fa1a54035f8335c9e1bbc991f209e1d1b5450f7f602b1e2963bc0cf6dcac
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.tw/app/406889139/coin-master-free-link-spin-game-hack PDF link annotation
    • https://www.sonestad.se/library/repository/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/level-coin_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/how-to-get-robux-easy_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/how-do-you-get-robux_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/jailbreak-hacks-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/free-roblox-avatar-items_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/how-to-get-minecraft-for-free-on-xbox-360_GM479516143.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/coin-master-cheat-apk-free-download_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/cool-hacker-names-for-roblox_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/coin-master-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/pubg-uc-malaysia-murah_GM1330123889.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/roblox-hacked-client-esp_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/coin-master-hack-version-2021_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/coin-master-hack-tool-for-pc_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/good-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/tiktok-free-view-30-detik_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_off0000314a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x314A 22516 bytes
SHA-256: b61e9a76d7f9f4aa6ac2d0383f3158dfd14d84bc509e3744dd901830b339c0c8
font_01_sfnt_off00006362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6362 18344 bytes
SHA-256: 4cc6e2dc521752f6662ff63411afc6c7bdb40e83b7743aeaa6a2e3eea921da6e

Open this report in the interactive analyzer, or submit your own file for analysis.