Malicious PDF — malware analysis report

Static analysis result for SHA-256 be41d1bb54bac8ea…

MALICIOUS

PDF

65.3 KB Created: 2020-08-30 15:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f40749b27cbb86d4582bbd9bdda54c22 SHA-1: 76f690e0f6ce843db1e6a462df3df72a02dda553 SHA-256: be41d1bb54bac8ea968de9ecebc5f017210b7aa642eecd0c213c097141617423
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to PDF files hosted on Shopify. One of these links, 'https://ttraff.com/wix?keyword=bianca+strange+michael+ruby', is identified as a known malicious redirector. The ML classifier also flagged this PDF as malicious with high confidence. The document body appears to be malformed or obfuscated, but the presence of the malicious redirector URL is the primary indicator of malicious intent.

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=bianca+strange+michael+ruby
    • https://cdn.shopify.com/s/files/1/0438/9987/9576/files/23905613975.pdf
    • https://cdn.shopify.com/s/files/1/0431/4903/3627/files/vajarurudasolikejigime.pdf
    • https://cdn.shopify.com/s/files/1/0434/3287/0037/files/79679521924.pdf
    • https://cdn.shopify.com/s/files/1/0467/9702/9525/files/lfs_indir_son_srm.pdf
    • https://cdn.shopify.com/s/files/1/0437/8315/9957/files/blokus_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0435/1901/7124/files/rorurudeseboxo.pdf
    • https://cdn.shopify.com/s/files/1/0432/7230/6852/files/15748137812.pdf
    • https://cdn.shopify.com/s/files/1/0430/5240/0789/files/52335128613.pdf
    • https://cdn.shopify.com/s/files/1/0436/2626/6782/files/cable_tray_installation.pdf
    • https://cdn.shopify.com/s/files/1/0428/2613/7756/files/calendar_2020_free.pdf
    • https://static.usrfiles.com/ugd/b8c837_e81b3a8bda664ba2b2e53345be4cb0df.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c88fd91eb284196bf4a88e69f2587c6.pdf
    • https://static.usrfiles.com/ugd/760101_700531ac3c304d34bdce47544cd39238.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/
    • https://cdn.shopify.com/s/files/1/0436/2626/6782/files/cable

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009fdf.bin
233a900fbb25e32b751b0138c48a56c70d497eb557a8c7df6e52e1748f39e1e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FDF 5276 bytes
font_01_sfnt_off0000b19f.bin
ee236ad1f999c6a696f8a8d21e8546a2116b9be7514d3285d0b7912273bddf5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB19F 10700 bytes
font_02_sfnt_off0000d522.bin
40f545b605a758491f9d84ee4d1a8e071ec29cb878aa3e72a2a2e03c7e9c58e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD522 16084 bytes
font_03_sfnt_off0000e9da.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DA 4324 bytes

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