Malicious PDF — malware analysis report

Static analysis result for SHA-256 3de3b973c25d3e03…

MALICIOUS

PDF

41.9 KB Created: 2020-08-21 00:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 239a41105b1d9e214154b93b918ae6d0 SHA-1: 3e3220c12f6608629d7957da5a8b5899b61d4fda SHA-256: 3de3b973c25d3e03ac7441d5dd213bd9635c1aa02ab9915f66454a1f1f04a3c7
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic, suggesting the document's primary purpose is to redirect users to malicious sites, likely for further exploitation or phishing.

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.ru/pify?keyword=automated+testing+on+android+devices
    • http://soregod.hebrewespresso.com/uploads/1/3/1/6/131606122/3606134.pdf
    • http://files.petersknifeshop.ch/uploads/1/3/1/4/131454012/cd19e2207c8.pdf
    • http://files.barronparkpreschool.com/uploads/1/3/2/6/132681409/merezes.pdf
    • http://totabob.sanfranciscozen.org/uploads/1/3/0/7/130776485/57d7084a36.pdf
    • http://files.carrolltonwmu.com/uploads/1/3/2/6/132695698/848c4.pdf
    • https://cdn.shopify.com/s/files/1/0431/5109/8007/files/pozejulomogevujisofuduvom.pdf
    • https://cdn.shopify.com/s/files/1/0440/7679/4008/files/bhagavad_gita_slokas_with_meaning_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9493/3665/files/pujelixememuf.pdf
    • https://cdn.shopify.com/s/files/1/0428/0441/2583/files/commercial_property_lease_agreement_template_south_africa.pdf
    • https://cdn.shopify.com/s/files/1/0432/6863/6834/files/51624212440.pdf
    • https://cdn.shopify.com/s/files/1/0434/7500/9686/files/answer_machine_argos.pdf
    • https://cdn.shopify.com/s/files/1/0428/7463/4403/files/faringoamigdalitis_bacteriana_adultos.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/daruni.pdf
    • https://cdn.shopify.com/s/files/1/0430/8933/0325/files/29190646378.pdf
    • https://cdn.shopify.com/s/files/1/0438/4676/2656/files/kojubewimorol.pdf
    • https://cdn.shopify.com/s/files/1/0431/4077/6093/files/23565064221.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_off00006528.bin
2f5e527594ef48c94b8138b0d8000f9605faedf15e7e849ebe609f8c272e3037
pdf-font-stream PDF embedded font (sfnt) at offset 0x6528 5276 bytes
font_01_sfnt_off00007707.bin
e36c15c4ce312186244ae80b26d4156e63bb293a98068d151d73e671c63a5865
pdf-font-stream PDF embedded font (sfnt) at offset 0x7707 10300 bytes