Malicious PDF — malware analysis report

Static analysis result for SHA-256 6490e49df48c69da…

MALICIOUS

PDF

46.4 KB Created: 2021-06-11 13:42:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f9330a748106c2a9cd88fbf66f39755b SHA-1: 114848c7f7de86aef115b218d4c5295033e225af SHA-256: 6490e49df48c69daea4a8140fd154883b6ff0b00ae167bc865f905692f4acb7e
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-free-robux-on-roblox-mobile-2021-game-hack PDF link annotation
    • http://library.ulb.ac.id//repository/coin-master-free-spins-link-2021-april_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-spins-on-coin-master-2021-ios_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-free-spins-link-haktuts_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-jailbreak-hack-download_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-accessories-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/if-you-delete-minecraft-can-you-redownload-it-for-free_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/tiktok-free-online_GM835599320.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/what-tiktok-free-views-without-verification_GM835599320.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/best-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/getting-my-roblox-account-hacked_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/best-ways-to-make-robux-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/dominus-roblox-free_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/op-rewards-free-robux_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_off00005291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5291 26792 bytes
SHA-256: 98f9db71273ca74c6eed983fc1e41fbf8d52835ae57fb88428f7ff689f0f723c
font_01_sfnt_off000090af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90AF 19072 bytes
SHA-256: f0b25f136ebb2895d844edb46d9a5ac8aedc6bce8d2e9e7d8a5d19ba5244cab3

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