Malicious PDF — malware analysis report

Static analysis result for SHA-256 c616cbb39bda137d…

MALICIOUS

PDF

61.1 KB Created: 2020-08-07 08:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9868a7d7feefcb1424a81f21a1a7dae SHA-1: ac1bf7f3b89c1b7cbb29398d3ee46b6692f788df SHA-256: c616cbb39bda137d1c0582ed1e08d910034c9effbd7d3b2c303ee7dac61f61c6
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.cc, which is designed to lead users to further malicious content. The document body, though heavily obfuscated, contains the same URL and a title suggesting a document about public administration reform in Brazil, likely a lure. The presence of numerous external links, many pointing to Shopify domains, suggests a link farm or content distribution network used to host malicious files. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=uma+reforma+gerencial+da+administra%25C3%25A7%25C3%25A3o+p%25C3%25BAblica+no+brasil+pdf
    • http://files.tpccommunicationsaustin.com/uploads/1/3/1/4/131453054/8e408bb02.pdf
    • http://bezaled.youngwriterscampuncg.com/uploads/1/3/0/8/130874431/jumifufirezu-mipunetanan.pdf
    • http://files.estellessweetitchblankets.com/uploads/1/3/1/3/131383493/wanodasa.pdf
    • http://kineje.demonjardin.com/uploads/1/3/0/8/130874359/wanoxodiku.pdf
    • http://files.mmha.net/uploads/1/3/0/7/130775249/4903196.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65529241957.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/embryological_and_fetal_development.pdf
    • https://cdn.shopify.com/s/files/1/0435/3009/2712/files/cisco_catalyst_3850_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/3531/9702/files/attestation_employeur_cpam.pdf
    • https://cdn.shopify.com/s/files/1/0439/6980/6494/files/guillain_barre_syndrome_causes.pdf
    • https://cdn.shopify.com/s/files/1/0431/6263/2360/files/list_of_2013_comedy_films.pdf
    • https://cdn.shopify.com/s/files/1/0433/0386/2440/files/51574176470.pdf
    • https://cdn.shopify.com/s/files/1/0430/8146/6005/files/tutis.pdf
    • https://cdn.shopify.com/s/files/1/0436/1139/0115/files/famexeza.pdf
    • https://cdn.shopify.com/s/files/1/0432/5287/5432/files/ampicilina_sulbactam_bula.pdf
    • https://cdn.shopify.com/s/files/1/0431/4890/2557/files/status_anxiety_alain_de_botton_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/5744/6050/files/93833318137.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_off0000a6c2.bin
98b882998e982913fefe81d42d14e167765faecb916c130826302aa40616e81a
pdf-font-stream PDF embedded font (sfnt) at offset 0xA6C2 6224 bytes
font_01_sfnt_off0000bac3.bin
680eb5355477c4ae1f658018cd01289e5113bfa1be411dc63631d1513e61e67d
pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC3 13932 bytes