Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f44af4ad1b3a7a…

MALICIOUS

PDF

58.2 KB Created: 2020-09-04 12:39:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1054c02db76c54f9e653db29ead8d457 SHA-1: 2a431e4f9df69c0d37e32d6af17dd04bbe6326a0 SHA-256: a8f44af4ad1b3a7a100a1bfca5f2cd52debef525591df294612aa601e421c21f
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.me/wix?keyword=balancing+chemical+equations+worksheet%2523+3'. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify domains, likely for SEO manipulation. The ML classifier strongly flagged this PDF as malicious.

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.me/wix?keyword=balancing+chemical+equations+worksheet%2523+3
    • https://static.usrfiles.com/ugd/b8c837_89cef761142c4c779db0111a0104eadd.pdf
    • https://static.usrfiles.com/ugd/70c1f8_0d7d4646a7244548a604e8d155fc3558.pdf
    • https://static.usrfiles.com/ugd/b8bbd7_f7105f1414c44b938455bb41c135c33a.pdf
    • https://static.usrfiles.com/ugd/dcf311_69754d31c61f44a095e61bb63bd03b19.pdf
    • https://cdn.shopify.com/s/files/1/0431/2491/6388/files/bijizinun.pdf
    • https://cdn.shopify.com/s/files/1/0435/4303/6053/files/butcher_s_crossing.pdf
    • https://cdn.shopify.com/s/files/1/0432/8269/4312/files/boterejerutinonep.pdf
    • https://cdn.shopify.com/s/files/1/0435/3399/2085/files/dudipulilupof.pdf
    • https://cdn.shopify.com/s/files/1/0437/1634/6007/files/bitiwuzozurojuwagemo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7727/1716/files/40655584571.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/73121007565.pdf
    • https://cdn.shopify.com/s/files/1/0438/0642/5249/files/baptism_sheet_cakes_for_twins.pdf
    • https://cdn.shopify.com/s/files/1/0432/8115/4198/files/cisco_firepower_4120_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/0849/0663/files/vuluzalugulanuboxis.pdf
    • https://cdn.shopify.com/s/files/1/0431/5847/0813/files/xodalazijeminorowo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008bc0.bin
4aba2bb845853324476be69e5ed1bf4ff35002942389efac2b843cac1129f0e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BC0 2828 bytes
font_01_sfnt_off000095bb.bin
9aa647cbf3266a74bb491277ee64b367ae459c505568af838dd1382a1f72216c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95BB 5428 bytes
font_02_sfnt_off0000a80a.bin
b95139fc5037f28bc4f1d9d9e8acc6688a70d8d3b1d3340a4dfb4ccceff9bf66		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA80A 10536 bytes
font_03_sfnt_off0000cb8b.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8B 4324 bytes

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