Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c1767a9211eefc0…

MALICIOUS

PDF

62.1 KB Created: 2020-09-01 04:40:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22477572d21320a46bc95ddff2acccf8 SHA-1: b13805db64cedfa4de26920ac98288dc5d0bcf50 SHA-256: 4c1767a9211eefc09950737f7aa84d69dbe7b82e5ce60771e84f7696ddc6fcdf
154 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, pointing to 'https://ttraff.ru/wix?keyword=world+important+days+in+telugu+pdf'. This URL is presented within the document body, disguised as a link to a PDF about 'world important days in telugu'. The ML classifier also strongly indicated maliciousness. The file is likely a lure to redirect users to malicious infrastructure.

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.ru/wix?keyword=world+important+days+in+telugu+pdf
    • https://static.usrfiles.com/ugd/dba42a_e6930caeef8d4312b8b4fee159477594.pdf
    • https://static.usrfiles.com/ugd/67e251_b87bedb2e7e84745bee1343b09e0a9fa.pdf
    • https://static.usrfiles.com/ugd/20d83a_1553a2fc99a6454fbdac186c85876439.pdf
    • https://static.usrfiles.com/ugd/b8c837_910df292a6bd4eab87c6b13ed7267d7d.pdf
    • https://static.usrfiles.com/ugd/0b46e6_9309484f41cb4b7787e6af2a80be26fd.pdf
    • https://cdn.shopify.com/s/files/1/0431/0774/5958/files/cox_security_suite.pdf
    • https://cdn.shopify.com/s/files/1/0428/4222/6854/files/46070592211.pdf
    • https://cdn.shopify.com/s/files/1/0430/7478/1338/files/noviwaxaxojenuva.pdf
    • https://cdn.shopify.com/s/files/1/0436/1689/5133/files/ansiedad_y_depresion_en_adolescentes.pdf
    • https://cdn.shopify.com/s/files/1/0437/2499/6758/files/xezovipedenezelatudu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5925/6232/files/no_manches_frida_free_download_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0438/6340/8795/files/vadejirerobezuxamupupoj.pdf
    • https://cdn.shopify.com/s/files/1/0430/6498/3703/files/vunowe.pdf
    • https://cdn.shopify.com/s/files/1/0437/8542/0949/files/tesoxu.pdf
    • https://static.usrfiles.com/ugd/b8c837_11aa4c9333a142c0af0c7741f0e27970.pdf
    • https://static.usrfiles.com/ugd/99a8f2_29771d52da404197b0a86ac132b7a5a0.pdf
    • https://static.usrfiles.com/ugd/3e9e83_26c46bdf23ef4a2eac0611122de1d7b5.pdf
    • https://static.usrfiles.com/ugd/b8c837_019bf0379c7b4e1faca1db5e2cfd3c5d.pdf
    • https://static.usrfiles.com/ugd/0c41e7_ef555bce2f95446e81ba67c6fc3c33bb.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_off0000b5c8.bin
4bb47c24143dfa4dcff0ab7be16fb16659e39430bdcfd20f6d6122a462b7f444		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C8 5476 bytes
font_01_sfnt_off0000c864.bin
1211e81c73a88bab6830f9aa223076a32431aa5d71e05ab102d4efe27455ecd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC864 10128 bytes

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