Malicious PDF — malware analysis report

Static analysis result for SHA-256 808762d8cf137835…

MALICIOUS

PDF

58.8 KB Created: 2020-09-10 14:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b726499f29333e255816deac09665b3 SHA-1: bd7ffedb81b7763e8a74169db0a1ddc9efeab775 SHA-256: 808762d8cf13783511d26e36dc8e3e99a2728b0ed47b89c862ae2c4ff9aa7245
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body contains a URL that appears to be the primary lure, directing users to a malicious 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.link/wix?keyword=cell+cycle+reporter
    • http://files.tridenthandyman.com/uploads/1/3/1/4/131408024/rusujugonefolag_duxajuvinalax_zatato.pdf
    • http://pitafas.northwalestreeservices.com/uploads/1/3/1/3/131380505/xabepululedu-vusozafetu.pdf
    • http://zumozixa.jingshuw.org/uploads/1/3/1/3/131381489/gexetitubivuv.pdf
    • http://files.allthatsparklescheshire.co.uk/uploads/1/3/1/6/131606331/ebc08d158.pdf
    • http://polubonag.topcoatuk.co.uk/uploads/1/3/0/7/130776769/5b24f3d7f89d098.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/97454987384.pdf
    • https://cdn.shopify.com/s/files/1/0436/4478/0697/files/employee_handbook_template_california.pdf
    • https://cdn.shopify.com/s/files/1/0438/2585/6662/files/information_about_gst.pdf
    • https://static.usrfiles.com/ugd/9b7d8a_f5931633f9fe46dcad1c7a23637b0441.pdf
    • https://static.usrfiles.com/ugd/ef7b09_f41c2b6a4b6346a4a0228a7ce05c6780.pdf
    • https://static.usrfiles.com/ugd/4bdc6d_1e04f870eed3415db1cddd995d8ccc80.pdf
    • https://static.usrfiles.com/ugd/9a242c_a28b151ab8e245179bdd4b3c51f89109.pdf
    • https://static.usrfiles.com/ugd/7ad284_f157e55d488e429082a3a48df5e34f82.pdf
    • https://cdn.shopify.com/s/files/1/0436/7400/9753/files/wildgame_innovations_camera_troubleshooting.pdf
    • https://cdn.shopify.com/s/files/1/0435/0607/3759/files/79334948212.pdf
    • https://cdn.shopify.com/s/files/1/0437/4586/9985/files/powitalivekugo.pdf
    • https://cdn.shopify.com/s/files/1/0464/6374/6200/files/metformin_dosage_for_weight_reduction.pdf
    • https://cdn.shopify.com/s/files/1/0431/9582/6336/files/gozubefimiwojafuzif.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009dba.bin
f4a832160ce3766452cb1fdb52a85e9a27f071938d94560c6098e2fdbba8f1fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DBA 4296 bytes
font_01_sfnt_off0000ac6b.bin
74de6f5f05895634ac3a410128c70cd247f445b94dae7f38e6189904b5de9d83		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC6B 10496 bytes
font_02_sfnt_off0000d040.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD040 4324 bytes

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