Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d0bea1f36e21804…

MALICIOUS

PDF

47.7 KB Created: 2020-08-03 06:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd7bf2c304ce0dcc46b1b8aef4b5e89a SHA-1: f73c5da658a18ae45e0553fce27865283d6d61b7 SHA-256: 4d0bea1f36e218041d9d7dc88efba10957071cf2a8e65bf342ab9ccf0deb4662
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a search result for an 'Epson eb-l1300u pdf'. This link, https://ttraff.ru/wb?keyword=epson%20eb-l1300u%20pdf, leads to known malicious infrastructure. The document also contains a large number of embedded links to various PDF files hosted on Shopify, likely part of a link farm to improve search engine ranking for malicious content. No scripts were extracted, but the primary attack vector is the embedded malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wb?keyword=epson%20eb-l1300u%20pdf
    • http://files.yunkawasiperu.org/uploads/1/3/1/3/131379612/vizarifogumawov.pdf
    • http://files.lincolnconcretenpaving.com/uploads/1/3/0/7/130775504/womapurifutavopu.pdf
    • http://files.pregnancylossinsilence.com/uploads/1/3/0/9/130969206/dc64b658b3f1.pdf
    • http://files.noellegracephotos.com/uploads/1/3/0/7/130776518/jowowuruzet.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78683638278.pdf
    • https://cdn.shopify.com/s/files/1/0434/7353/5142/files/49423676483.pdf
    • https://cdn.shopify.com/s/files/1/0431/6204/2532/files/lafugijeranew.pdf
    • https://cdn.shopify.com/s/files/1/0427/8714/3839/files/55333275282.pdf
    • https://cdn.shopify.com/s/files/1/0434/7265/0397/files/begosumavezozafinoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/5450/5885/files/bajasugerur.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/95181885481.pdf
    • https://cdn.shopify.com/s/files/1/0432/5546/4104/files/loss_models_from_data_to_decisions.pdf
    • https://cdn.shopify.com/s/files/1/0431/9815/2866/files/39800414837.pdf
    • https://cdn.shopify.com/s/files/1/0434/2890/5127/files/mimugumalesa.pdf
    • https://cdn.shopify.com/s/files/1/0432/4327/4395/files/nokitosavi.pdf
    • https://cdn.shopify.com/s/files/1/0446/3758/5571/files/affidavit_of_motor_vehicle_gift_transfer_texas.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_off00006c38.bin
96fa3870cf7f5f1ee2f521558996a90b432d763a51e0ce23cf34c19466463af8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C38 5216 bytes
font_01_sfnt_off00007e16.bin
8147cceda8b813855fe444d81e6057c145b4ecbcfe1c35a0ab19b3a4139892bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E16 17488 bytes

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