Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba5d9c0afa81bca2…

MALICIOUS

PDF

45.1 KB Created: 2021-05-16 21:01:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d82f732ecfd33f68a1bbde20cd3fe8bc SHA-1: 29cb2230bbeb2132dab04930b159d0b9305a6c44 SHA-256: ba5d9c0afa81bca27ba223b95164a869821eba2905cf9950c87596e994a7c8be
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, identified as a link farm, suggesting a deceptive SEO or content-luring tactic. The document body and embedded links point towards free spins and game hacks, likely a lure to drive traffic to malicious sites. The ML classifier also strongly indicated maliciousness.

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 https://netcdn.xyz/app/406889139/free-spins-coin-master-2021-glitch-game-hack
    • https://elearning.mansamura.sch.id/__statics/gudangsoal/files/coin-master-free-spin-realme-products_GM406889139.pdf
    • https://elearning.mansamura.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-verifying_GM431946152.pdf
    • https://elearning.mansamura.sch.id/__statics/gudangsoal/files/easy-ways-to-get-free-robux_GM431946152.pdf
    • https://elearning.mansamura.sch.id/__statics/gudangsoal/files/free-robux-glitch_GM431946152.pdf
    • https://elearning.mansamura.sch.id/__statics/gudangsoal/files/roblox-hacked-version_GM431946152.pdf
    • https://elearning.mansamura.sch.id/__statics/gudangsoal/files/real-free-spins-for-coin-master_GM406889139.pdf
    • https://elearning.mansamura.sch.id/__statics/gudangsoal/files/coin-master-free-spins-hack-ios_GM406889139.pdf
    • https://elearning.mansamura.sch.id/__statics/gudangsoal/files/how-do-u-get-free-robux-2021_GM431946152.pdf
    • https://elearning.mansamura.sch.id/__statics/gudangsoal/files/roblox-free-clothes-hack_GM431946152.pdf
    • https://elearning.mansamura.sch.id/__statics/gudangsoal/files/coin-master-hack-tool-pc-download_GM406889139.pdf
    • https://elearning.mansamura.sch.id/__statics/gudangsoal/files/robux-converter_GM431946152.pdf
    • https://elearning.mansamura.sch.id/__statics/gudangsoal/files/free-robux-no-verification-or-survey-2021_GM431946152.pdf
    • https://elearning.mansamura.sch.id/__statics/gudangsoal/files/get-roblox-for-free_GM431946152.pdf
    • https://elearning.mansamura.sch.id/__statics/gudangsoal/files/roblox-free-play-no-download_GM431946152.pdf
    • https://elearning.mansamura.sch.id/__statics/gudangsoal/files/minecraft-iphone-free_GM479516143.pdf
    • https://elearning.mansamura.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdf
    • https://elearning.mansamura.sch.id/__statics/gudangsoal/files/coin-master-free-spins-and-coins-link-haktuts_GM406889139.pdf
    • https://elearning.mansamura.sch.id/__statics/gudangsoal/files/minecraft-free-minecraft_GM479516143.pdf
    • https://elearning.mansamura.sch.id/__statics/gudangsoal/files/coin-master-free-spins-daily_GM406889139.pdf
    • https://elearning.mansamura.sch.id/__statics/gudangsoal/files/roblox-free-robux-codes_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004d96.bin
2c18574f50b71355bdd3f1d2321045c096526862a9c4dfdfd9b84dda54148e49		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D96 28416 bytes
font_01_sfnt_off00008d6e.bin
8c6d4bd1280aaca7551541ea66dfc454f80fb022d039b81e2f7b76bbe9834590		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D6E 18528 bytes

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