Malicious PDF — malware analysis report

Static analysis result for SHA-256 23c1abb7fc8de102…

MALICIOUS

PDF

48.5 KB Created: 2020-08-29 19:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cc0426858342315da483996ab70b5f4 SHA-1: bf0b2feb13b0d6b76eec1de6e14e67441fc09a0b SHA-256: 23c1abb7fc8de102490056c01b482355aceac141c342b6b33415ab462e0bd22c
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=teor%25C3%25ADa+de+las+colisiones'. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially corrupted, contains the malicious URL and references to other PDFs, suggesting a lure to external content.

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.cc/wix?keyword=teor%25C3%25ADa+de+las+colisiones
    • https://cdn.shopify.com/s/files/1/0431/3694/2234/files/24910816138.pdf
    • https://cdn.shopify.com/s/files/1/0431/3900/6632/files/zetojopojarijijunenid.pdf
    • https://cdn.shopify.com/s/files/1/0440/1581/2766/files/bawizizomi.pdf
    • https://cdn.shopify.com/s/files/1/0430/3906/4225/files/the_blueprint_zip.pdf
    • https://cdn.shopify.com/s/files/1/0462/6789/1861/files/pervasive_sql_odbc_driver.pdf
    • https://static.usrfiles.com/ugd/ec0c41_ee6427c978d544ed904050909f1a77fa.pdf
    • https://static.usrfiles.com/ugd/b4a829_07669fb650734411b7a7082ece723c31.pdf
    • https://static.usrfiles.com/ugd/b8c837_13cff52808c341408d9d2ff4f2ff97d2.pdf
    • https://static.usrfiles.com/ugd/b8c837_92f61fd7709348829d26cdb77bbda20c.pdf
    • https://static.usrfiles.com/ugd/6240f8_37a5747e8bf146ff993f72bc457d43d3.pdf
    • https://static.usrfiles.com/ugd/a298ce_2534a14c1c00446384e7f5cce68790cf.pdf
    • https://cdn.shopify.com/s/files/1/0431/3235/4727/files/12315777326.pdf
    • https://cdn.shopify.com/s/files/1/0435/8311/1323/files/21296093708.pdf
    • https://cdn.shopify.com/s/files/1/0434/2225/3205/files/school_bus_information_ocdsb.pdf
    • https://cdn.shopify.com/s/files/1/0434/7677/9174/files/cardiovascular_system_of_human_body.pdf
    • https://cdn.shopify.com/s/files/1/0456/8422/8255/files/maneuvering_board.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_off000060dc.bin
78c92d1f5f315ee35080387dbbe5a030a0f16f1102aa1e9369774613e72b11a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60DC 4936 bytes
font_01_sfnt_off000071b1.bin
c2fc35115b4fe87ea271726b3292b3da51ed233225c60683de4b0a488e7c9ea8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71B1 14232 bytes
font_02_sfnt_off00009e20.bin
e474db4e7d345958cd13626d156e6f43b18a6c6ffbd98f3fa16b1063dab06702		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E20 16084 bytes

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