Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa1789ff24484ffb…

MALICIOUS

PDF

34.5 KB Created: 2021-07-06 04:32:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 81b1d2a2d53c5e845522813d0c6204c2 SHA-1: be7ae19c80503b68ff48340de669c416bfc56cf2 SHA-256: aa1789ff24484ffb1e3dad91ffd4863d0aa15283392fc630d92230fc0376a70b
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links, including one to 'netcdn.tw', which are identified as part of a link farm and game hack lure. The document body and heuristics suggest the primary goal is to redirect users to potentially malicious sites by promising free game items or currency. No scripts were extracted, but the nature of the links and the ML classification indicate a high likelihood of malicious intent.

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/431946152/roblox-shirt-template-free-game-hack PDF link annotation
    • http://www.library.umbjm.ac.id/repository/10m-8-7m-17-free-robux-daily_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spins-no-generator_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/2021-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/all-free-items-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/dll-files-hack-for-roblox-vehicle-simulator-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/hack-for-rpg-world-on-roblox-to-get-money-fast_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-robux-in-alternate-route_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-free-rubox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/robux-download_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/test-all-free-roblox-gear-free-admin-hacking-scripts_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-minecraft-printables-food-labels_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/daily-free-coin-and-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/daily-coin-master-free-spin-link-facebook_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/get-free-robux-add-codes_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/rblx-gg-tons-of-robux-free_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-spin-ml-link_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-coin-and-spin-link_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F55 22204 bytes
SHA-256: ccd4cca8c62aaf9af741735328ddb61811ee5645d1874abb100ab45a0026aee6
font_01_sfnt_off000060ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60BA 19476 bytes
SHA-256: 39f31297814331a53f6b553485ee4f398b4780561fca342eeeaa3a41f125c1d6

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