Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d3d879eb3bbf14…

MALICIOUS

PDF

35.9 KB Created: 2021-06-28 14:01:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 33b39f3fe5eb6bc0fe459374ae600bc9 SHA-1: 287c5231e4f1c5976f8e1a50ffb73ef2b01e6b30 SHA-256: b6d3d879eb3bbf14ef8270d6b3455538dfe200304c70e80da6209e8ae73d9397
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a document body that promotes websites offering free Robux and Coin Master spins. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or scam operation. The ML classifier also flagged the PDF as malicious. While no scripts were explicitly extracted, the nature of the content and the embedded links strongly suggest a phishing or scam attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/hgood-websites-to-get-free-robux-from-game-hack PDF link annotation
    • https://7gking.tw/upload/files/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://7gking.tw/upload/files/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://7gking.tw/upload/files/coin-master-free-chip_GM406889139.pdfIn PDF document text
    • https://7gking.tw/upload/files/how-to-hack-someone-for-robux_GM431946152.pdfIn PDF document text
    • https://7gking.tw/upload/files/h1-class-free-robux-123-576-678-h1_GM431946152.pdfIn PDF document text
    • https://7gking.tw/upload/files/free-roblox-accessories-codes_GM431946152.pdfIn PDF document text
    • https://7gking.tw/upload/files/coin-game_GM406889139.pdfIn PDF document text
    • https://7gking.tw/upload/files/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • https://7gking.tw/upload/files/free-roblox-clothes-templates_GM431946152.pdfIn PDF document text
    • https://7gking.tw/upload/files/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://7gking.tw/upload/files/coin-master-unlimited-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://7gking.tw/upload/files/carding-for-pubg-uc_GM1330123889.pdfIn PDF document text
    • https://7gking.tw/upload/files/how-to-get-robux-easy_GM431946152.pdfIn PDF document text
    • https://7gking.tw/upload/files/hacks-on-roblox-prison-life_GM431946152.pdfIn PDF document text
    • https://7gking.tw/upload/files/coin-master-hack-tool-without-verification_GM406889139.pdfIn PDF document text
    • https://7gking.tw/upload/files/roblox-scripts-free_GM431946152.pdfIn PDF document text
    • https://7gking.tw/upload/files/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • https://7gking.tw/upload/files/coin-master-gifts_GM406889139.pdfIn PDF document text
    • https://7gking.tw/upload/files/how-many-has-roblox-warrior-cats-been-hacked_GM431946152.pdfIn PDF document text
    • https://7gking.tw/upload/files/coin-master-free-spins-link-march-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
font_00_sfnt_off00003449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3449 22252 bytes
SHA-256: cc8b43b473351ba741c2c010b148cdd8b8fe0b7f55741550afaef718223d9df7
font_01_sfnt_off000065cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65CD 19572 bytes
SHA-256: e88ae299ae7e0dc824bb3f751e719b046015ea5355ed00059598123f332020c4

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