Malicious PDF — malware analysis report

Static analysis result for SHA-256 0db30b5c6db47930…

MALICIOUS

PDF

40.1 KB Created: 2020-08-18 15:40:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03c981fdaa7781d161adadff6f81df77 SHA-1: bf10a0fc5b2146ec71377614db6e039ab2802d1e SHA-256: 0db30b5c6db479306adf7525eeeaef9b726e213fa2a52bfb2f1256e0fc5eb6cd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body text is heavily obfuscated but contains the URL that is also present in the heuristic firing. This suggests a link-farming or SEO-spam campaign designed to redirect users to malicious sites.

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=ncert+class+11+biology+text+book
    • http://files.bororunning.org/uploads/1/3/1/4/131407047/xagabenanovideze.pdf
    • http://pebakoreg.ramirezpecanfarm.com/uploads/1/3/1/8/131871390/aa70f644bcade.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/1796/8543/files/skyrim_guide_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/9726/8128/files/5999234353.pdf
    • https://cdn.shopify.com/s/files/1/0434/3287/0037/files/where_does_pip_install_packages.pdf
    • https://cdn.shopify.com/s/files/1/0448/5061/0336/files/landlady_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0449/2935/1835/files/jalekikilekukuloseroved.pdf
    • https://cdn.shopify.com/s/files/1/0434/8290/6789/files/dovalivoputedixose.pdf
    • https://cdn.shopify.com/s/files/1/0429/8519/3621/files/74868630054.pdf
    • https://cdn.shopify.com/s/files/1/0432/6536/0034/files/bhojpuri_gana_wala.pdf
    • https://cdn.shopify.com/s/files/1/0428/5664/4774/files/using_financial_accounting_information_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/1229/1751/files/trans_siberian_orchestra_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/7173/1880/files/employee_performance_evaluation_examples.pdf
    • https://cdn.shopify.com/s/files/1/0428/8462/8633/files/breath_holding_spells_treatment.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f83.bin
34d0f1767fd0d815b592fc15500bd161aa6c6806120184e333118f418bff2637
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F83 5360 bytes
font_01_sfnt_off000071dc.bin
8965bc0bcf931e6461bee45331773a257fd2a5bcf2dc4d9064e72fe29d87a111
pdf-font-stream PDF embedded font (sfnt) at offset 0x71DC 9980 bytes