Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c5e5286f7db3490…

MALICIOUS

PDF

45.6 KB Created: 2020-08-19 06:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 749a63cf2eb06fffe4bc111208e256bf SHA-1: dc5f08c56a537372dc9da8f7b7ef51a6d8c2471a SHA-256: 7c5e5286f7db34907928fd1c654e0df9d5f461414011e368d99b12090c2e6413
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. This suggests the primary purpose is to lure users to malicious sites, likely for phishing or to download further malware.

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/pify?keyword=ccs+web+date+sheet
    • http://pebowo.kellyeharnett.com/uploads/1/3/0/9/130969744/jugifavisadanawo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/9708/7390/files/zubinunaxime.pdf
    • https://cdn.shopify.com/s/files/1/0433/4302/0183/files/clothes_worksheet_intermediate.pdf
    • https://cdn.shopify.com/s/files/1/0431/3668/0098/files/analog_and_digital_transmission_in_computer_networks.pdf
    • https://cdn.shopify.com/s/files/1/0439/6616/9246/files/kamawisipokidaporul.pdf
    • https://cdn.shopify.com/s/files/1/0430/7451/9194/files/bapuwujewawosesexe.pdf
    • https://cdn.shopify.com/s/files/1/0428/8220/3801/files/36463414354.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lekutaxawiwasutoxojopelor.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nakawefefaf.pdf
    • https://cdn.shopify.com/s/files/1/0428/5064/8223/files/jejiduzisinin.pdf
    • https://cdn.shopify.com/s/files/1/0437/7886/7354/files/surigabatokutodepazuve.pdf
    • https://cdn.shopify.com/s/files/1/0431/5293/3019/files/tigafosisogizememafa.pdf
    • https://cdn.shopify.com/s/files/1/0427/9628/6111/files/46652124027.pdf
    • https://cdn.shopify.com/s/files/1/0430/6331/2533/files/dawiverapatunefod.pdf
    • https://cdn.shopify.com/s/files/1/0430/9522/8565/files/wivosuw.pdf
    • https://cdn.shopify.com/s/files/1/0428/8118/8003/files/foxavuvuko.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_off0000694c.bin
e671bfa0da94a71c9136d5f4b3efbda867de018bc47d3e1b565bc8c5c28cd790		 pdf-font-stream PDF embedded font (sfnt) at offset 0x694C 4680 bytes
font_01_sfnt_off00007940.bin
c6829f65469977f3357b18f3b69421e72ecbd52c9d158836b64bf499a44e50ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7940 9908 bytes
font_02_sfnt_off00009b28.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B28 4324 bytes

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