Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b88ecc56d8c6e1c…

MALICIOUS

PDF

45.1 KB Created: 2021-05-11 07:30:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 486698c2ae6cb098bcb657cbdddab0e3 SHA-1: e37376e00ec713726992d943fdb7626dd474090d SHA-256: 5b88ecc56d8c6e1c445261f5b180584054373cae1bd24118602555402f4074bb
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free game hacks and generators to entice users. It contains multiple links to malicious redirector infrastructure, such as 'https://netcdn.xyz/app/479516143/free-minecraft-hacks-game-hack', which likely serves as a gateway to further malicious content or downloads. The document body, though partially corrupted, contains similar URLs and text related to game hacks, reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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
  • 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.xyz/app/479516143/free-minecraft-hacks-game-hack In PDF document text
    • https://c2o-library.net/catalog/repository/hacks-for-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-spin-links-coin-master-october-30-2021_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-free-spin-link-list_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-hack-app-android-download_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/minecraft-pe-apk-download-free-015-0_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/minecraft-free-unblocked_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/minecraft-name-tag-hacks_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/easy-robux-today-com_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/www-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/http-bitly-coin-master-free-2021-spins_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-hack-ios-2021_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-free-robux-without-verifying-2021_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
stream_003_off00004cf5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CF5 30148 bytes
SHA-256: 41b0f57fe5869c96b705bafb1d16c431528ad550c1a1fb06403c9487c72e7612
font_01_sfnt_off00008fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FEC 17740 bytes
SHA-256: 02673fc9b31aa1f7767db1cd16a9f6370da751ac2c2fa3ca820772adadbcecd3

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