Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b11abb8a5ac0b0…

MALICIOUS

PDF

38.8 KB Created: 2020-08-07 06:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89393f2db86edf652cf6929388fa5d5f SHA-1: cc46d9bd7207594728b30a26df8237cad647d250 SHA-256: c5b11abb8a5ac0b06535a7275f55c4d70cd61f8387742421724b7839369c6907
160 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, which is also present in the document body. The document also exhibits characteristics of a password-protected archive lure, suggesting the user is prompted to download an encrypted file. Multiple links to external PDFs were found, many hosted on Shopify, with one redirecting through a malicious domain.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=amls+2020+pdf+2da+edicion+descargar+gratis
    • http://files.orderbrewtoledo.com/uploads/1/3/0/8/130813362/1111872.pdf
    • http://files.marsokickz.com/uploads/1/3/0/7/130775649/depuredutivirin.pdf
    • http://files.be-remarkable.com.au/uploads/1/3/0/7/130738554/ba70baf96.pdf
    • https://cdn.shopify.com/s/files/1/0430/5672/6170/files/pefolexojom.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38967404473.pdf
    • https://cdn.shopify.com/s/files/1/0433/7221/6483/files/36064402316.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87277754858.pdf
    • https://cdn.shopify.com/s/files/1/0450/6717/4040/files/enduring_vision_apush_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0431/5339/1765/files/59139305693.pdf
    • https://cdn.shopify.com/s/files/1/0437/5199/7592/files/turibuxuzijigapinewak.pdf
    • https://cdn.shopify.com/s/files/1/0430/6780/1749/files/9577270352.pdf
    • https://cdn.shopify.com/s/files/1/0430/4646/9793/files/zikugivatepixegoxofe.pdf
    • https://cdn.shopify.com/s/files/1/0440/5189/0341/files/pakuzuzedazowilesipizu.pdf
    • https://cdn.shopify.com/s/files/1/0434/8857/5638/files/absolute_essentials_of_music_theory_for_guitar.pdf
    • https://cdn.shopify.com/s/files/1/0433/9544/8997/files/zuwukiporozipetofilat.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/2283550224.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/2997/files/68042221880.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_off000057dd.bin
fb7a9dd0a5e747ba0da5191273e6b6f6a3a6e1985e5bdd57819876b5bf33b001
pdf-font-stream PDF embedded font (sfnt) at offset 0x57DD 5740 bytes
font_01_sfnt_off00006b55.bin
c1985a2cfcd0b28608d93706ca0563a22a33cc805a0e5952ff1e999501ab3c64
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B55 10148 bytes