Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6943df58996eb55…

MALICIOUS

PDF

42.5 KB Created: 2021-05-16 00:07:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2612dcc71ffb5f67b4876b72815715b3 SHA-1: 2c6e2d81dde311a979b6057e958e3b929b2f63bf SHA-256: c6943df58996eb55c717b1237ae042b9f90944a4417cef602d0a2dbaeac1555e
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to sites offering free in-game currency and hacks. The ML_NYX_PDF_MALICIOUS heuristic also flagged the document with high confidence. The document body and extracted URLs suggest a lure for users seeking game advantages, likely leading to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/coin-master-daily-free-spins-2021-game-hack PDF link annotation
    • http://cintabaca.org/katalog/repository/how-to-get-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/i-want-free-robux_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/haktuts-coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/links-to-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/coin-master-hack-without-verification-for-iphone_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/coin-master-hack-using-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-get-roblox-credit-for-free_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/coin-master-free-chip_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/unlimited-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-roblox-clothes-for-your-avatar_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/hack-coin-master-game_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-coins-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/wurst-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/free-roblox_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/coin-master-free-coins-2021_GM406889139.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_off00004a46.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A46 24784 bytes
SHA-256: 0c39dfd45bc0ce2b4ba5bb107f3d81ddc238b197c5a090eff0e8b76ae17bf5ed
font_01_sfnt_off00008278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8278 18708 bytes
SHA-256: 0e09573a858265cfc65c534eb28458a66078312e2bd7bae94317e03ea41fcd19

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