Malicious PDF — malware analysis report

Static analysis result for SHA-256 33ccbb783958e27c…

MALICIOUS

PDF

44.3 KB Created: 2020-07-16 21:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06f175a62ef44aed3e4a132b396657af SHA-1: fba8f5726f6b8a2c020cf1e61f60ce1f50ddee86 SHA-256: 33ccbb783958e27c3c5ba4bcdad1c701805995120af319b836eaf35035eaa52f
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be garbled, suggesting it's not intended for human consumption but rather to host these links. The primary attack pattern involves leveraging these links for SEO manipulation or redirection to malicious content.

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.ru/wb?keyword=pengertian%20pendidikan%20jasmani%20olahraga%20dan%20kesehatan%20pdf
    • http://files.lttn.com/uploads/1/3/1/4/131437677/zelofed.pdf
    • http://files.hopehomeinspections.com/uploads/1/3/0/8/130813461/5311040.pdf
    • http://files.stevemager.com/uploads/1/3/0/9/130969402/1406598.pdf
    • http://files.superiorselfwithkjlandis.com/uploads/1/3/1/4/131437626/tawubarosax.pdf
    • http://files.spamitzvah.com/uploads/1/3/1/3/131384789/2268709.pdf
    • http://files.fifilashes.com/uploads/1/3/1/8/131856133/fumubopijorafezowew.pdf
    • http://files.thefibreshop.com/uploads/1/3/0/8/130813855/652583.pdf
    • http://files.dglivestock.com/uploads/1/3/1/4/131437785/6688914.pdf
    • http://files.vtphisig.org/uploads/1/3/1/3/131383247/javiz_jisidaf_virubisit.pdf
    • http://files.superiorselfwithkjlandis.com/uploads/1/3/1/4/131437626/tawubarosax.pd
    • https://nanesufated.files.wordpress.com/2020/06/xaluzudaxojamulaki.pdf
    • https://zizixabaga.files.wordpress.com/2020/07/lukiragisubomabugunof.pdf
    • https://lojategi.files.wordpress.com/2020/07/39970252630.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gowavofopinesifaremoka.pdf
    • https://cdn.shopify.com/s/files/1/0429/4819/8556/files/86308532163.pdf
    • https://cdn.shopify.com/s/files/1/0430/9575/2864/files/68513829807.pdf
    • https://cdn.shopify.com/s/files/1/0434/3152/6557/files/4723705887.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gozoba.pdf
    • https://cdn.shopify.com/s/files/1/0434/0118/3397/files/32792980908.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6537/files/6544219952.pdf
    • https://cdn.shopify.com/s/files/1/0432/7096/3350/files/zibusiruvupu.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_off00006e93.bin
96744c316f6c73b448a83afe3090a5251e2b91a231f9ce730249f35bddc1687d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E93 5384 bytes
font_01_sfnt_off000080b2.bin
fa0101d9e63f5c5316104d09fce6e90c8b43b65f9289fff0aeb7576f69732bfd
pdf-font-stream PDF embedded font (sfnt) at offset 0x80B2 10124 bytes