Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b5e5d16e131f5c…

MALICIOUS

PDF

51.4 KB Created: 2020-08-09 11:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1a7b89afe0c4fbd9c60f88ec9191f51 SHA-1: bd0baeef52a044f5c6113f286711dde4fb2e4901 SHA-256: d4b5e5d16e131f5c54b5262e664a36ca4f969d178a0aef9c025265a2237bd6fb
150 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, which is also present in the document body. The ML classifier strongly indicates maliciousness. The document appears to be a lure, using a public administration theme to trick users into clicking the malicious URL. No scripts were extracted, but the primary attack vector is the embedded malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/pify?keyword=administra%25C3%25A7%25C3%25A3o+p%25C3%25BAblica+municipal+para+concursos+pdf
    • http://lifanuwor.beyondpromarketing.com/uploads/1/3/1/1/131164250/dafigisebi.pdf
    • http://lemesep.fitfamconshy.com/uploads/1/3/1/0/131069839/5785422.pdf
    • http://files.msumun.org/uploads/1/3/0/9/130969140/7647878.pdf
    • https://cdn.shopify.com/s/files/1/0433/1080/9256/files/brgschaftserklrung_eltern.pdf
    • https://cdn.shopify.com/s/files/1/0428/2561/3468/files/zorujoloxozubinopiwa.pdf
    • https://cdn.shopify.com/s/files/1/0432/3554/1151/files/best_thesaurus_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0438/1566/5824/files/bivosusefavovepazaguna.pdf
    • https://cdn.shopify.com/s/files/1/0440/0440/9494/files/quick_sort_in_c.pdf
    • https://cdn.shopify.com/s/files/1/0439/2851/8824/files/gothic_2_requiem.pdf
    • https://cdn.shopify.com/s/files/1/0439/9369/4366/files/soil_amendments.pdf
    • https://cdn.shopify.com/s/files/1/0431/1167/8114/files/suzukagejukobaxirutixasiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/1548/8163/files/capitalism_a_short_history.pdf
    • https://cdn.shopify.com/s/files/1/0433/3728/5797/files/44152302616.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000082cd.bin
8e416d74f07f96aba671b060ae7efd39c86a60bed869714395c5a0b327944435		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82CD 6044 bytes
font_01_sfnt_off0000962c.bin
239ae847f4b68803e8ef56a9b1dee72216cd7c4aee0716d4ea2e33b27c934fad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x962C 13568 bytes

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