Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2099b038eaff6be…

MALICIOUS

PDF

54.1 KB Created: 2020-08-30 06:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1843cc840d4c8718db717e320c64f9f6 SHA-1: 17e2a36367b1c574a2300c2111d25309186b3ea2 SHA-256: e2099b038eaff6be308e133bc09a920481fb18ad995bd433f2d300c77d134ba5
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/wix?keyword=adding+and+subtracting+unlike+fractions+worksheets'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many of which are benign. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to contain the same redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.com/wix?keyword=adding+and+subtracting+unlike+fractions+worksheets
    • https://static.usrfiles.com/ugd/19103d_6d401119e2aa4ed09d8b034d48a7d786.pdf
    • https://static.usrfiles.com/ugd/9374a7_f0ebeaffb15f428fa62a9f24856ec3d6.pdf
    • https://static.usrfiles.com/ugd/b8c837_396a42f591524d1b83156bef42351dca.pdf
    • https://cdn.shopify.com/s/files/1/0440/0313/1542/files/modular_belt_conveyor.pdf
    • https://cdn.shopify.com/s/files/1/0428/0942/6079/files/juzafukawusajexugivorazu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0164/2135/files/speech_bubbles_generator.pdf
    • https://cdn.shopify.com/s/files/1/0437/3417/1800/files/71763370036.pdf
    • https://cdn.shopify.com/s/files/1/0429/5743/9129/files/john_deere_110_mower.pdf
    • https://static.usrfiles.com/ugd/b8c837_6ed78aad2bad426683c752065a27b131.pdf
    • https://static.usrfiles.com/ugd/764aaa_c67dad8ae62e4234a37c6423234adac1.pdf
    • https://static.usrfiles.com/ugd/8b2c09_9b9ebfbc29974547a2c3484b44020ea2.pdf
    • https://static.usrfiles.com/ugd/a6e5e9_fc7aedc9eee64113ad0cb9d464609c88.pdf
    • https://static.usrfiles.com/ugd/b8c837_a8132269b2054bcd8464b320a2d9008d.pdf
    • https://static.usrfiles.com/ugd/516793_1eec57e8df194d1ca53eff410a76b7c7.pdf
    • https://static.usrfiles.com/ugd/d94ae5_862b95b261ff4724a3014e71a28952e9.pdf
    • https://static.usrfiles.com/ugd/cc03df_253a8864edd945f0a27303e1036b149c.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008123.bin
7da80ee940266e0a752c3e5d2ef3c527a35ed356424642fc619f52e95ba2ad51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8123 5568 bytes
font_01_sfnt_off00009419.bin
9b103380116bccfcbca692c5f4f3b5914a8e898d3f019d8ba2cb37e46fb800ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9419 9712 bytes
font_02_sfnt_off0000b59a.bin
4a83d890a47edb08c66ed977e452dfc2aca54227ac21f6fa21ed0d0aaea40951		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB59A 16116 bytes

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