Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c31a72145e1b69c…

MALICIOUS

PDF

85.9 KB Created: 2020-11-03 21:30:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: dd9c56e48961425dc02870ad84aa3ab6 SHA-1: 28a0672da4de0abf9b3b9d7f460fb427caef0309 SHA-256: 9c31a72145e1b69c24d9cb990c4e23e4fcb0c8ff9cdb7f33daeec6b8dac9dc17
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses an invoice-themed lure. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/123?keyword=please+confirm+receipt+of+email+meaning In PDF document text
    • https://pepotoxuxomupav.weebly.com/uploads/1/3/1/4/131483830/7613128.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369499/normal_5f898a555d1f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369501/normal_5fa12e5313d93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371246/normal_5f8a192188bb4.pdfIn PDF document text
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/5074685.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/fusionner_des_fichiers_gratuit.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/japanese_alphabet_writing_practice.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6532/2901/files/questions_and_answers_about_the_book_hatchet.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/73438085556.pdfIn PDF document text
    • https://s3.amazonaws.com/texifaxepag/16750062965.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/1165/9678/files/types_of_interviews_in_qualitative_research.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ACA 22624 bytes
SHA-256: ec7eafe85e8658d383cc9eacec337c71ccf21a8c3b9f7ed847167b2dea8d2318
font_01_sfnt_off0000b1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A0 5336 bytes
SHA-256: 1e8510cb58efc0b37f05a3a57a1bcce30ffba8b9aaac0fdd3977ab9a32bafa97
font_02_sfnt_off0000c3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B2 2656 bytes
SHA-256: dbaab8dcf32bfe64cb008f34eb54f5316f62236e8dffe3de49b44225404383a5
font_03_sfnt_off0000ceb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB6 2328 bytes
SHA-256: 864cbe2c6973b44d2b71e19ffbffb2328dcb3759b07ceb43c11d5a372fc4956d
font_04_sfnt_off0000d96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96C 2108 bytes
SHA-256: d117309382da938f7dffedc42f90dd4217b4d540d75629b80669d975ecbc171e
font_05_sfnt_off0000e337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE337 6640 bytes
SHA-256: 538512be6c526ea957b587fa229624d829dca4873b622d187784a60d2c877fcd
font_06_sfnt_off0000f4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D5 14588 bytes
SHA-256: 983ac2bc4fa3d08196f89ab00463a8bc8057d631a3ad5e545e08a4d2e45b21b7
font_07_sfnt_off000121fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FC 16652 bytes
SHA-256: 7a9c5fb7eeb4649bbd2e4829a82ec4878e04ce1a731831e195831218810fb264
font_08_sfnt_off0001392a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1392A 3276 bytes
SHA-256: c12c670e310cd2dd0f4b1ea6ea0d01ef35e1284caa1cfc967b978b02bd897c09