Malicious PDF — malware analysis report

Static analysis result for SHA-256 244347d23b86fe7b…

MALICIOUS

PDF

44.7 KB Created: 2021-05-18 02:42:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b00f6b4dfb5fc6a488b9aad92f33e08f SHA-1: e835208bbe6886bc04f680e68960d823fc6a08f5 SHA-256: 244347d23b86fe7bc8384dcf0963c4510bd44fc9cd1e77e791209923f309d7f4
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which are SEO-optimized and point to sites offering in-game currency or items for popular games like Coin Master and Roblox. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document may also attempt to trick users into revealing sensitive information. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.xyz/app/406889139/coin-master-free-spin-link-today-download-game-hack PDF link annotation
    • http://bit-sky.com/images/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/free-robux-real_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/update-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/app-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/coin-master-mod-free-download_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/real-robux-codes_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/coin-master-free-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/get-me-free-robux_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.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
stream_003_off0000489a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x489A 24592 bytes
SHA-256: 80829ee393b898fadae27a3bb8a12230ee5b313787c557b54506e7761b99cca4
font_01_sfnt_off000080c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80C2 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A73 18816 bytes
SHA-256: c5a160641c4edab75c60996e0f798f3e883f872898d31e041e46be69cf2ac151

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