Malicious PDF — malware analysis report

Static analysis result for SHA-256 adea7af4b6175971…

MALICIOUS

PDF

44.6 KB Created: 2020-08-06 04:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c991526df63ad8f354a729e6e47035c0 SHA-1: c9d723678cbac73234e339321b981dbb68ba1182 SHA-256: adea7af4b6175971c7eb66fc24d4340b4a761f9cf349dffe9588ff54373c4098
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to Shopify domains hosting other PDFs, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Bhartiya samvidhan ki anusuchi pdf' and the wkhtmltopdf generator, suggesting a lure to download a PDF. The ML classifier strongly flagged this PDF as malicious, supporting the presence of malicious redirector links.

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=bhartiya+samvidhan+ki+anusuchi+pdf
    • http://files.postmaster-jobs.com/uploads/1/3/0/7/130738603/ae0eab6.pdf
    • http://files.lavishsalonharrisburg.com/uploads/1/3/0/8/130874317/wimunipefasibisagaw.pdf
    • http://files.jjtothethirdpower.com/uploads/1/3/0/8/130813141/faretitutarit_rufoboxal_guwadotipa_sevafasedelesuw.pdf
    • http://files.runnxc.com/uploads/1/3/0/8/130813736/barim.pdf
    • http://files.amurdoch.com/uploads/1/3/0/7/130740318/3ceb116e3cabbe8.pdf
    • https://cdn.shopify.com/s/files/1/0430/6858/8194/files/boguzemovu.pdf
    • https://cdn.shopify.com/s/files/1/0428/5127/0823/files/lexukek.pdf
    • https://cdn.shopify.com/s/files/1/0434/6534/3141/files/xedeparomukeretowozuke.pdf
    • https://cdn.shopify.com/s/files/1/0428/3249/4751/files/34024421092.pdf
    • https://cdn.shopify.com/s/files/1/0430/5072/9634/files/convert_cdr_file_to_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0439/0692/4712/files/cara_membuat_google_form_excel.pdf
    • https://cdn.shopify.com/s/files/1/0432/7063/5680/files/woneboralarej.pdf
    • https://cdn.shopify.com/s/files/1/0437/1464/2069/files/escoliosis_angulo_de_cobb.pdf
    • https://cdn.shopify.com/s/files/1/0433/6097/7048/files/76634201130.pdf
    • https://cdn.shopify.com/s/files/1/0430/3287/1074/files/calendario_spal_2020_19.pdf
    • https://cdn.shopify.com/s/files/1/0433/9151/6826/files/new_general_maths_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0434/7808/9878/files/caldera_rip_manual_espaol.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_off00006c5f.bin
d6ab928e0668d8c4217f8e9557567ea7c1504e41636d2142212cf8e3ea67673b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C5F 5640 bytes
font_01_sfnt_off00007f72.bin
3ba71ac239b94844ee78b6debd298ef9457b0ccfa92045ef3eedbb5100b643da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F72 10548 bytes

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