Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2523f289d7ca689…

MALICIOUS

PDF

47.7 KB Created: 2020-08-15 04:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebe632c02f84272c55407de39430d66c SHA-1: ccff84a9f0743863c0c91a41d701c5b29f02c71c SHA-256: d2523f289d7ca68910f6bb4a97d7820c4af25dbfcb5d1d288b5a25be70b87a49
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=business+expenses+spreadsheet+template', is designed to redirect users to malicious content. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, many of which are hosted on Shopify. The ML classifier strongly indicated maliciousness. The primary attack pattern is social engineering, leveraging a plausible lure to drive traffic to the malicious redirector.

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.cc/pify?keyword=business+expenses+spreadsheet+template
    • http://peladugel.bedrockgardens.org/uploads/1/3/1/1/131163992/voboxafezozapin_fazuperorupirur.pdf
    • http://files.pemichoral.org/uploads/1/3/0/9/130970003/904241341ba5.pdf
    • http://jajoni.casa-office.co.uk/uploads/1/3/0/7/130775364/karetufe.pdf
    • https://cdn.shopify.com/s/files/1/0434/0105/2310/files/breast_cancer_facts.pdf
    • https://cdn.shopify.com/s/files/1/0440/5864/0534/files/vitowiwigodoram.pdf
    • https://cdn.shopify.com/s/files/1/0431/2953/6676/files/43798560850.pdf
    • https://cdn.shopify.com/s/files/1/0428/7827/1651/files/76266374010.pdf
    • https://cdn.shopify.com/s/files/1/0432/2135/2606/files/biology_questions_and_answers_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89462818099.pdf
    • https://cdn.shopify.com/s/files/1/0431/1570/8573/files/jeromokufazosew.pdf
    • https://cdn.shopify.com/s/files/1/0440/5778/8568/files/carbon_steel_grades_and_properties.pdf
    • https://cdn.shopify.com/s/files/1/0448/5431/3122/files/anemia_de_clulas_falciformes_diagnostico.pdf
    • https://cdn.shopify.com/s/files/1/0432/6578/6006/files/10629482264.pdf
    • https://cdn.shopify.com/s/files/1/0437/6910/2485/files/carol_of_the_bells_satb_a_cappella.pdf
    • https://cdn.shopify.com/s/files/1/0433/3253/4440/files/nomexajelik.pdf
    • https://cdn.shopify.com/s/files/1/0433/2843/8440/files/80346771449.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_off00007af9.bin
178a21efbfb3b71907bff17df5b011f1ac5f04cda57ca23c22603f51363e4d76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AF9 5316 bytes
font_01_sfnt_off00008cdd.bin
d68b09f05af348c0ca6f54991b1e22071db67139919f9320a558ba654672d0e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CDD 10824 bytes

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