Malicious PDF — malware analysis report

Static analysis result for SHA-256 323b9ca5404f904b…

MALICIOUS

PDF

46.8 KB Created: 2021-06-04 02:25:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 324d7c80c00afd49df74c3fc569aaffd SHA-1: 09321e31105a605356f1ca1feca3bd8d84fa4ba4 SHA-256: 323b9ca5404f904b66c3cd0f7962e49a6db0ebd766d5749255d43137cc3b7067
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded links, many of which are structured as SEO-optimized URLs pointing to what appear to be download sites for game-related cheats and hacks. The ML classifier strongly indicated maliciousness, and the presence of a "download button" heuristic further supports a lure-based attack pattern. The primary goal appears to be directing users to external sites for potentially malicious software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

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.online/app/479516143/minecraft-hacks-wurst-game-hack PDF link annotation
    • http://oca.undil.tl/repository/daily-coin-master-free-spin-apk_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/offers-for-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-minecraft-for-free-on-chromebook_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-script-injector-for-roblox_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-to-village-3-in-coin-master_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-apk-35-8_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-apk-ios_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-free-spins-on-coin-master-2021-links_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/legit-coin-master-hack-site-zyngaplayerforumscom_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-quiz_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/collect-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-spin-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-spins-no-generator_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-coins-coin-master-today_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • https://www.youtIn PDF document text
    • https://sigmaclient.info#2In PDF document text
    • https://flux.today#3In 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_off0000517c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x517C 25104 bytes
SHA-256: 8a39569185938c2913d6ab7233809f0bc5f55f6654bbb8a5d1d415ad49a28c22
font_01_sfnt_off00008afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AFB 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off000094ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94AE 18076 bytes
SHA-256: 3e7497e6bc4bf84e5186ee2c608eda5b15e7e8e7c6854cdd6eb66a0ec10d8832

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