Malicious PDF — malware analysis report

Static analysis result for SHA-256 2acea7e5003cc917…

MALICIOUS

PDF

47.6 KB Created: 2021-06-08 16:32:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 262a6e07f7b3ef2a5ef747607a7615b5 SHA-1: 86705aab9b9ff505746b8cf07c43ae640867e6d2 SHA-256: 2acea7e5003cc917cd40f2733618c03a688315bbbd119de9741fd16d467db0c9
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links and a link farm, all pointing to websites that promise free in-game currency or hacks for popular games like Roblox and Coin Master. The ML classifier strongly flagged this PDF as malicious, and the presence of these lures suggests a phishing or scam campaign. Although no scripts were directly extracted, the PDF structure and embedded URIs indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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/i-get-free-robux-game-hack
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/how-to-hack-a-roblox-account-2021_GM431946152.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/coin-master-fan-page-free-spins_GM406889139.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/haktuts-coin-master-free-spin-link_GM406889139.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/how-to-get-free-robux-without-getting-an-app_GM431946152.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/free-robux-for-tablet-pro_GM431946152.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/coin-master-daily-free-spin-app_GM406889139.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/adidas-tracksuit-roblox-for-free_GM431946152.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/roblox-eating-simulator-hack_GM431946152.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/free-robux-no-hack-robuxian_GM431946152.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/what-app-do-you-use-to-get-robux-for-free_GM431946152.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/roblox-to-get-robux-hack_GM431946152.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/hack-free-robux-no-human-verification_GM431946152.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/how-to-hack-peoples-accounts-on-roblox-2021_GM431946152.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/default-fortnite-roblox-tshirt-free_GM431946152.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/minecraft-apk-free-download_GM479516143.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/free-robux-no-saving_GM431946152.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/how-to-hack-someone-on-roblox-2021_GM431946152.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/roblox-caveman-simulator-hack-script_GM431946152.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/a-code-to-get-free-robux_GM431946152.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/roblox-surf-hack_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050e5.bin
01628dc76fe09414f8563dd410f25f2a3f195e5b3a7b6fe088eb8c8f377319c7		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50E5 26780 bytes
font_01_sfnt_off00008df6.bin
10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DF6 2880 bytes
font_02_sfnt_off000097e1.bin
4d71d68463dc14713e44f9683acd550328d7e5bad803756a396486e1ac955c1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97E1 18120 bytes

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