Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6a27f882183cfe5…

MALICIOUS

PDF

45.4 KB Created: 2021-06-09 12:32:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ae3bd0284b6906bc088db373a24354c4 SHA-1: 40938faebad6f9a0cf985a54c2ee7e1fffa76030 SHA-256: e6a27f882183cfe5d9f66e1934caea0e68bbba9d146d044b07ebb6b5cd3430fc
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, identified as a PDF link farm, likely intended to manipulate search engine results or distribute further malicious content. The document body, though heavily obfuscated, contains a URL pointing to a "Bloxburg Roblox Money Hack", suggesting a lure for users seeking game cheats. The presence of a ML classifier flagging the PDF as malicious and the heuristic identifying a link farm strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/bloxburg-roblox-money-hack-game-hack PDF link annotation
    • http://reggieslockandkey.com/images/coin-master-free-cards-and-spin-link_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-stolen-roblox-games-download_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/minecraft-free-trial_GM479516143.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/pokemon-go-free-balls-code_GM1094591345.pdfIn PDF document text
    • http://reggieslockandkey.com/images/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/roblox-how-to-get-free-vip-in-fashon-frenzy_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-t-shirt-roblox_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-robux-hack_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/demon-roblox_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/coin-master-free-spins-link-2021-today_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_004_off00005048.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5048 25880 bytes
SHA-256: bf522e95ba5e355a0e967c1df48cd2e434e61e4ea168224c97c8b7161a8c0d43
font_01_sfnt_off00008ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CCB 18988 bytes
SHA-256: 281d13ac921e8bef0708bef306de1e0ff4f577dd7e971494bebc9372d5cfab83

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