Malicious PDF — malware analysis report

Static analysis result for SHA-256 223c91a9d08c7932…

MALICIOUS

PDF

42.6 KB Created: 2020-08-08 08:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da04451dcbf26fc88b2296c09678535e SHA-1: b7daac1a091fb5cfac3ad73fe13958f20fa0ac82 SHA-256: 223c91a9d08c7932f5ff100e0cb9711f477917905a08139a1667ebf4e7e14017
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains, including a known malicious redirector. The ML classifier also flagged this PDF as malicious. The document body contains text related to 'Aktiv passiv englisch �bungen l�ckentext alle zeiten pdf' and includes the malicious redirector URL, suggesting a lure to potentially malicious content or a phishing attempt.

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=aktiv+passiv+englisch+%25C3%25BCbungen+l%25C3%25BCckentext+alle+zeiten+pdf
    • http://files.theyogasocial.com/uploads/1/3/0/9/130969334/deziwusezif.pdf
    • http://files.tlfamilydetective.com/uploads/1/3/0/7/130739826/3382453.pdf
    • http://files.lgeorgeswalledlake.com/uploads/1/3/0/7/130739864/rimunalesimo-xigodumuloraz.pdf
    • https://cdn.shopify.com/s/files/1/0440/0663/7726/files/abbyy_transformer_3._0_pro_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/8515/8813/files/bafabokuvopuk.pdf
    • https://cdn.shopify.com/s/files/1/0427/6341/9815/files/tetofedekewom.pdf
    • https://cdn.shopify.com/s/files/1/0434/0465/6797/files/gmat_integrated_reasoning_practice_test.pdf
    • https://cdn.shopify.com/s/files/1/0440/4648/3606/files/98748337783.pdf
    • https://cdn.shopify.com/s/files/1/0429/2296/7206/files/windows_xp_32_bit_iso_download_microsoft.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/telisupuf.pdf
    • https://cdn.shopify.com/s/files/1/0431/1931/3062/files/wepidop.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/40948382406.pdf
    • https://cdn.shopify.com/s/files/1/0434/3896/4903/files/discord_bot_record_audio.pdf
    • https://cdn.shopify.com/s/files/1/0429/1664/2975/files/cutnell_and_johnson_physics_9th_edition.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_off0000636b.bin
9bf4a2c926dde2fab0193a61d8c3603546002a34cd10a194d2844cc3093abb08
pdf-font-stream PDF embedded font (sfnt) at offset 0x636B 5812 bytes
font_01_sfnt_off00007716.bin
109db0f909e2645c7a9c2a76a8246257a6f06f61fca9e06591b399f2db76c9e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x7716 10732 bytes