Malicious PDF — malware analysis report

Static analysis result for SHA-256 febcb8548b341afc…

MALICIOUS

PDF

46.0 KB Created: 2021-06-11 11:20:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 6b0757ad15cd9f4412042c7baa227d11 SHA-1: f4451f21acb7d4464845f903d1f1f9f043008acd SHA-256: febcb8548b341afc4806275ffc47c91b51e1d81ecbcb2324cfe0557bb73a8ecc
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on brokermortgages.com and appear to be part of a link farm designed to attract users searching for game cheats and free accounts. The primary URL, https://netcdn.tw/app/431946152/eyes-the-horror-game-update-2-alpha-hack-roblox-game-hack, also points to a resource related to game hacking. This suggests a phishing or malware distribution attempt, likely using a spearphishing attachment as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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/eyes-the-horror-game-update-2-alpha-hack-roblox-game-hack PDF link annotation
    • http://brokermortgages.com/images/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://brokermortgages.com/images/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://brokermortgages.com/images/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://brokermortgages.com/images/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://brokermortgages.com/images/pokemon-go-free-team-change_GM1094591345.pdfIn PDF document text
    • http://brokermortgages.com/images/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://brokermortgages.com/images/how-can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://brokermortgages.com/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://brokermortgages.com/images/minecraft-login-free_GM479516143.pdfIn PDF document text
    • http://brokermortgages.com/images/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://brokermortgages.com/images/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • http://brokermortgages.com/images/free-accounts-on-roblox-that-have-robux_GM431946152.pdfIn PDF document text
    • http://brokermortgages.com/images/download-roblox-player-apk-free_GM431946152.pdfIn PDF document text
    • http://brokermortgages.com/images/coin-master-hacks-android_GM406889139.pdfIn PDF document text
    • http://brokermortgages.com/images/game-hacked-decal-roblox_GM431946152.pdfIn PDF document text
    • http://brokermortgages.com/images/tiktok-viewer-free_GM835599320.pdfIn PDF document text
    • http://brokermortgages.com/images/easy-robux-com_GM431946152.pdfIn PDF document text
    • http://brokermortgages.com/images/omplete-surveys-for-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://brokermortgages.com/images/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://brokermortgages.com/images/boombox-roblox-free-catalog_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_004_off00004d2c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D2C 25580 bytes
SHA-256: c9adcee96232a0bb3cfed561e86b2995386e6b31a5e42e5b0310d76f53c172e9
font_01_sfnt_off00008606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8606 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off00008fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FB5 19552 bytes
SHA-256: 5edf6d52926c60f404c4604a53f7fa08d0f39d9073d4d84e0a1ae9dc49c6d121

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