Malicious PDF — malware analysis report

Static analysis result for SHA-256 e18880099ef88ae8…

MALICIOUS

PDF

63.0 KB Created: 2020-08-30 00:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3ef6656b6d5d80212b0357cd83468f9 SHA-1: f2b581ebbedb39b179de8e8ba72b39279e49f6b4 SHA-256: e18880099ef88ae8bfcf35997c528e55152b6538834316ba21873af5495487a1
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a lure related to an assignment answer, designed to trick users into clicking a link. The embedded link redirects to `https://ttraff.cc/wix?keyword=506+assignment+answer+in+english+pdf`, which is flagged as a malicious redirector. The file also contains a large number of links to external PDFs, many hosted on `static.usrfiles.com`, suggesting a link farm or SEO poisoning tactic to distribute malicious content.

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://ttraff.cc/wix?keyword=506+assignment+answer+in+english+pdf
    • https://static.usrfiles.com/ugd/576447_8f4c7b34c8db40d2b003dd770e15daca.pdf
    • https://static.usrfiles.com/ugd/5ad03d_95cfc4de9f3b4649835254739d092713.pdf
    • https://static.usrfiles.com/ugd/b8c837_74c3717893964734b545cf26028f6726.pdf
    • https://static.usrfiles.com/ugd/b13fd1_a771efb8fdde433ab27cdc949193c443.pdf
    • https://cdn.shopify.com/s/files/1/0439/5833/7694/files/away_in_a_manger_piano_sheet_music.pdf
    • https://static.usrfiles.com/ugd/d94ae5_64d0d53afb50400fb5f4bef1042aa233.pdf
    • https://static.usrfiles.com/ugd/b8c837_01abae187c814641bd7c5b67a3d3278f.pdf
    • https://static.usrfiles.com/ugd/409ca8_1e99ccfb5a954d51a3fd13ee250491ab.pdf
    • https://cdn.shopify.com/s/files/1/0437/0140/3801/files/rinum.pdf
    • https://cdn.shopify.com/s/files/1/0430/7356/8919/files/free_b_boying_tutorials.pdf
    • https://cdn.shopify.com/s/files/1/0432/7381/4171/files/word_jumble_puzzle_answers.pdf
    • https://cdn.shopify.com/s/files/1/0448/5578/7681/files/maraturorolavijunijofo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 10

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000539a.bin
ca7c96ed9720d77f16828867b241c83e14f64eefcab195e7eb829c3b3f70a409		 pdf-font-stream PDF embedded font (sfnt) at offset 0x539A 5872 bytes
font_01_sfnt_off00006767.bin
ff8289fcab20b7b81f5dc7c47458689637225d7099c48932a46d6898d6123f6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6767 2656 bytes
font_02_sfnt_off0000726c.bin
9ecb621567b74df2ef17856ce034c88d10706283d7fa82c386f7da9f53f7e4a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x726C 4944 bytes
font_03_sfnt_off00008281.bin
18b250f24057ce91e4a59b25c1eec79fa8b4d7e2cb9f6c0de02c7e032a072fd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8281 2328 bytes
font_04_sfnt_off00008d38.bin
5fd53e2058c4f5d98b70161d670f1e42036942552fef68ac845a5e47e2d7f715		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D38 2604 bytes
font_05_sfnt_off00009857.bin
5fc9e2cd4e7ad04544edda2023dd698132b65daf167a61e09de9fd8de66d8b52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9857 2108 bytes
font_06_sfnt_off0000a22b.bin
87016e8933cc862d1d188edfbee698abcff8178ed3d6b510b61737ee02f60284		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA22B 4336 bytes
font_07_sfnt_off0000afcc.bin
64ec43f74326abb1816745b357e78d7a5d2327b3f835e41c45825803c0fe8356		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCC 11020 bytes
font_08_sfnt_off0000d56f.bin
0050349814d8658bed5856405982d73d43414675a208a2a55cd2b58c9d6303ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD56F 2704 bytes
font_09_sfnt_off0000e07c.bin
89aa5ef39ecd647c310fa7d43209dd0d208a608e38381102f2e40635d4f29b56		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE07C 2608 bytes

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