Malicious PDF — malware analysis report

Static analysis result for SHA-256 75fa77acfb811945…

MALICIOUS

PDF

49.5 KB Created: 2021-06-09 09:33:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 49436c40057ac477f07495b196577978 SHA-1: f51d5768ce827d0b62c301946862ca206ea727ba SHA-256: 75fa77acfb811945c1fa7f2c0696ae3d638bfbc62ad18463bc6e78821da431f7
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, identified as a link farm, pointing to external websites. The document body and extracted URLs suggest a lure related to 'hacking' or obtaining free in-game currency, which is a common tactic for phishing or malware distribution. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 4

  • 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
  • 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/haow-to-hack-robux-no-bc-game-hack PDF link annotation
    • http://katalog.gemalibrary.net/repository/coin-master-hack-no-survey-or-verification_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/roblox-data-breach_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-robux-generator-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/tiktok-viewer-free_GM835599320.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-codes_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-robux-link_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-spins-on-coin-master-app_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-to-earn-free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/minecraft-mod-menu-apk_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/114-hacks_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F97 30160 bytes
SHA-256: c720d310650c553e9b2213c070c8809d889eda0427321d92159066cbd401d8ed
font_01_sfnt_off000091ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91CA 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off00009e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E71 18412 bytes
SHA-256: d26d69e06e4e8544871f370b2b6df058aa61f008efa291332349f340490b76ba

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