Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ac110be9caaf25…

MALICIOUS

PDF

45.0 KB Created: 2021-06-11 12:02:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: e8f639d0caf20540da2ef119aff21e37 SHA-1: aac270f113090c12c372fa279ff12d4253a2b917 SHA-256: f8ac110be9caaf25625edd54da32a15ff14f9044d85627ec5a208e9564af000c
142 Risk Score

Malware Insights

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

The PDF contains numerous links to websites offering 'free generators' and 'hacks' for popular games, indicating a lure-based attack pattern. The heuristic 'PDF_SEO_LINK_FARM' suggests a large number of such links are present, likely to drive traffic to malicious sites. The ML classifier also strongly flagged this PDF as malicious.

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-robux-for-kids-that-can-hack-it-game-hack PDF link annotation
    • https://c2o-library.net/catalog/repository/are-minecraft-realms-free_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-for-free_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-no-download-app-but-play-for-free_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-links-for-free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/hack-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/probability-that-the-new-roblox-item-will-be-free_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/earn-free-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-earn-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-34-4-hack-download_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-free-spins-link-2021-app_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-app-2021_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/is-there-any-actual-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/fake-gps-for-pokemon-go-free_GM1094591345.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-free-spin-and-coin-link-today_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
stream_004_off00004f85.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F85 25552 bytes
SHA-256: 0836b81f28d47905fd1d967fbf25218fdf4817b65ca465a4745510445297647b
font_01_sfnt_off00008b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B42 18976 bytes
SHA-256: 6a9f95f207357a347e49937ab7d62d3f7f091aaee2d851b4a851a8d416e343ef

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