Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb9b12569b000a52…

MALICIOUS

PDF

42.6 KB Created: 2020-08-22 20:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 043460b748b7cda71b875adad8dfafad SHA-1: 04bc5213718f0ea1c031cfe8aa4771b4fe31a5f9 SHA-256: eb9b12569b000a5243d66c4e86cd632cb347966436dbf86384086f4a73210508
150 Risk Score

Malware Insights

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

The PDF file contains a lure related to a 'complaint adjustment letter template' and embeds a link to a known malicious redirector. The primary heuristic indicates the PDF links to malicious redirector infrastructure, and the ML classifier strongly supports a malicious verdict. The embedded URL is the highest priority IOC.

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/pify?keyword=complaint+adjustment+letter+template
    • http://files.1stshiplake.org/uploads/1/3/1/3/131384081/pavukutumade_xozebasibi.pdf
    • http://files.storymakerlife.com/uploads/1/3/0/7/130776407/wejus_maberevevo_xifemur_ruvipe.pdf
    • https://cdn.shopify.com/s/files/1/0431/8570/1019/files/cook_once_eat_all_week_cassy_joy_garcia.pdf
    • https://cdn.shopify.com/s/files/1/0431/7167/6314/files/duladebugula.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65817182127.pdf
    • https://cdn.shopify.com/s/files/1/0433/7932/7130/files/47912696867.pdf
    • https://cdn.shopify.com/s/files/1/0431/2724/2914/files/52177105770.pdf
    • https://cdn.shopify.com/s/files/1/0434/3113/3351/files/dependent_prepositions_test.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57727452667.pdf
    • https://cdn.shopify.com/s/files/1/0430/2995/4721/files/81929244151.pdf
    • https://cdn.shopify.com/s/files/1/0432/7007/8617/files/accountability_in_the_workplace.pdf
    • https://cdn.shopify.com/s/files/1/0431/9005/9176/files/lonudiroberodokifes.pdf
    • https://cdn.shopify.com/s/files/1/0430/9739/1261/files/karaoke_duet_48.pdf
    • https://cdn.shopify.com/s/files/1/0431/3828/5725/files/cd40110be_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/8478/3509/files/jureduzebalewuxelixizu.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_off000069b1.bin
77a07875efc5d77b7a21eae25282f88c9bb89f0e2a8eeb802358bda013935c49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69B1 5084 bytes
font_01_sfnt_off00007adb.bin
d44e7e8244a87b52ca2cff40b5058a05bf7fc6658f9862cf081527e318ef0981		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ADB 10200 bytes

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