Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea243a6d945f2f94…

MALICIOUS

PDF

39.6 KB Created: 2020-09-18 06:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f2ac61de279ea5c40f725d95c503a1b SHA-1: 55ece6d52cbb1f8c72c16af8d3dc711b4cd9a796 SHA-256: ea243a6d945f2f94127be8bf305c91a24014dd2b3897a16fcaa610a837f73f18
152 Risk Score

Malware Insights

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

This PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=scatter+plot+worksheet+5th+grade'. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to external malicious content. The ML classifier also strongly flagged this PDF as malicious. The file appears to be a link farm designed to drive traffic to the redirector.

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=scatter+plot+worksheet+5th+grade
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/61927850068.pdf
    • https://cdn.shopify.com/s/files/1/0433/4672/2974/files/8307316721.pdf
    • https://cdn.shopify.com/s/files/1/0431/5657/0266/files/guvanozazopi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0879/4530/files/vumulewebugijofodar.pdf
    • https://cdn.shopify.com/s/files/1/0480/2163/5231/files/section_35_2_the_nervous_system.pdf
    • https://cdn.shopify.com/s/files/1/0433/2408/0282/files/bootstrap_3_inline_form_select.pdf
    • https://cdn.shopify.com/s/files/1/0432/7325/7116/files/angularjs_typescript_directive_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/3323/9457/files/77355006165.pdf
    • https://cdn.shopify.com/s/files/1/0434/5928/1061/files/49295448698.pdf
    • https://cdn.shopify.com/s/files/1/0429/6150/2362/files/kepixuxet.pdf
    • https://3f6aed1b-b677-4c46-a55a-21342b3c43e4.filesusr.com/ugd/f84671_c1030e1c128e49cfb19551e799d34230.pdf?index=true
    • https://55c0dbc1-0b04-4600-b5e8-f30f60d1f1c2.filesusr.com/ugd/9f69bd_fca37c9e751d4d8babeb86536f0a27d9.pdf?index=true
    • https://a74d46be-156d-438c-950d-9bc2608d49c1.filesusr.com/ugd/d3758e_81d88463bade4ff4aa5c920f3d66dca8.pdf?index=true
    • https://7171f9b6-cfc1-4feb-8e66-c573da8a967c.filesusr.com/ugd/771ea4_ad0e2445ff694fb7a969b326e37c99df.pdf?index=true
    • https://d3ebbb44-400e-4f10-9990-4400ea747c9c.filesusr.com/ugd/f9d4cd_b0078030bf7a4b099a09ccac2d39cf74.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c07.bin
0ace1d6a9f5d234a0d5448b7fa54136721757c64376ba968dd27c52493497ddc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C07 5720 bytes
font_01_sfnt_off00006f8e.bin
97f9a456609696a7299530c1257033910877cb310f621dfeebb89fda9650a161		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F8E 9948 bytes

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