Malicious PDF — malware analysis report

Static analysis result for SHA-256 609d36872d2ed4d1…

MALICIOUS

PDF

45.9 KB Created: 2020-08-31 02:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 640d6e7142c81d89e497bcd76b7640b2 SHA-1: 942bfae5329207b01ad0d92dc6f921cd67c180a0 SHA-256: 609d36872d2ed4d19a0482c32f1c739a1de4873dbb6741092f096235fb8be8d4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users to malicious infrastructure. The primary redirector URL identified is ttraff.cc, which is flagged as malicious. The ML classifier also strongly indicated maliciousness.

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.cc/wix?keyword=motor+compuesto+diferencial
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/a6e5e9_527399c0639446bca8b007f91356eb14.pdf
    • https://static.usrfiles.com/ugd/ae15ca_58731af51bf746d8a3049cca86759841.pdf
    • https://static.usrfiles.com/ugd/b8c837_317bc0550ebd4c2b950a42dea582c972.pdf
    • https://static.usrfiles.com/ugd/286fb8_d0b8b8126f7e415596bbfcc976defd2d.pdf
    • https://static.usrfiles.com/ugd/defdb4_115bf67fe32346cab86202310683d2a7.pdf
    • https://static.usrfiles.com/ugd/8e1900_3361d78566aa44de8eb31ef192396bf1.pdf
    • https://static.usrfiles.com/ugd/63d3ad_8c50a82c4cec422db57aefc829861e62.pdf
    • https://cdn.shopify.com/s/files/1/0431/5535/7852/files/vepum.pdf
    • https://cdn.shopify.com/s/files/1/0428/4946/8582/files/71757234096.pdf
    • https://cdn.shopify.com/s/files/1/0430/5109/0077/files/86145180549.pdf
    • https://cdn.shopify.com/s/files/1/0434/0160/9366/files/33437225062.pdf
    • https://cdn.shopify.com/s/files/1/0431/4529/8074/files/sizetizi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6463/1195/files/fatoxowatukaguduwexoxekag.pdf
    • https://cdn.shopify.com/s/files/1/0432/9878/3382/files/74913980090.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005caf.bin
5ccc32da7950bbc00a56385a58334f583123b5e8aed43c6ae69d4ab9dbfbf2e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CAF 5304 bytes
font_01_sfnt_off00006eaa.bin
1a3138347c2487fb11b8094710fb70e7d8c4367eedf42ede789bead22e950332
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EAA 11432 bytes
font_02_sfnt_off000093fe.bin
2fbb528c30fae61c70ff4082faa5fece981988df10abad1a91cab371b780b9de
pdf-font-stream PDF embedded font (sfnt) at offset 0x93FE 16192 bytes