Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd5ebb05a3e357d0…

MALICIOUS

PDF

44.8 KB Created: 2020-08-07 23:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 393dbf91ee4506a728aa48e1f093c453 SHA-1: ca9da106d4b305727fdb2dbde597c4e6e2053751 SHA-256: dd5ebb05a3e357d062bf5d97e6d44231e69451fa3d696bdaf08b87a7e9776289
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that the link at https://ttraff.com/pify?keyword=in+defence+of+liberal+education+pdf is part of known malicious infrastructure. Additionally, the 'PDF_SEO_LINK_FARM' heuristic suggests the document is designed to host a large number of external links, likely for SEO manipulation or to distribute further malicious content. The ML classifier strongly supports the malicious verdict.

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.com/pify?keyword=in+defence+of+liberal+education+pdf
    • http://files.prettyprairiesoul.com/uploads/1/3/2/6/132681698/5007a63bf.pdf
    • http://tajev.harrisburgvictimhelp.org/uploads/1/3/1/3/131398222/6038713.pdf
    • http://files.mthomesandland.com/uploads/1/3/2/6/132681264/3495588.pdf
    • http://files.davidewinracing.com/uploads/1/3/1/0/131070313/dusejiluwa.pdf
    • http://files.oneapparelbrand.com/uploads/1/3/0/8/130815213/rosituritotudoxafo.pdf
    • https://cdn.shopify.com/s/files/1/0437/7133/0717/files/68465304125.pdf
    • https://cdn.shopify.com/s/files/1/0434/0265/7957/files/nolerup.pdf
    • https://cdn.shopify.com/s/files/1/0438/8261/0843/files/introductory_chemistry_5th_edition_nivaldo.pdf
    • https://cdn.shopify.com/s/files/1/0435/9654/6216/files/29996210040.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/26965864763.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pujofupokutesigitugut.pdf
    • https://cdn.shopify.com/s/files/1/0439/4015/1454/files/pubixox.pdf
    • https://cdn.shopify.com/s/files/1/0433/6995/5486/files/92798445614.pdf
    • https://cdn.shopify.com/s/files/1/0434/4011/1782/files/33460032044.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_off0000710f.bin
2f1c899a5cf2a1623744775dcaabaeebf75e652fdec44cf1d89e81e7f62e014d
pdf-font-stream PDF embedded font (sfnt) at offset 0x710F 5048 bytes
font_01_sfnt_off00008246.bin
f9ef5e2a61c9c40456494d240a419095c0e5c723dbbf525e1b800c6f2158f4a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x8246 10532 bytes