Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57dcab00af06ca6…

MALICIOUS

PDF

52.2 KB Created: 2020-08-29 22:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ee5ec5201f284a994909b18ac5615a6 SHA-1: 154f87b6ca4c4c0e2cd5ff431153c51978549f3b SHA-256: a57dcab00af06ca645f288cb62533a13829420a6ee0b314977e819c9db3e4d0c
120 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure ('Ensayo critico ejemplo'). The primary malicious IOC is the redirector URL, which is likely used to funnel victims to a phishing site or download further malicious content. The presence of numerous PDF links suggests a link farm or SEO poisoning tactic to increase visibility.

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.cc/wix?keyword=ensayo+critico+ejemplo
    • https://cdn.shopify.com/s/files/1/0427/7259/4844/files/android_appcompat_actionbar_text_color.pdf
    • https://cdn.shopify.com/s/files/1/0431/3110/9540/files/21725708016.pdf
    • https://cdn.shopify.com/s/files/1/0446/0537/4628/files/51526559355.pdf
    • https://cdn.shopify.com/s/files/1/0429/3948/2275/files/jovofizuzofakufojopanun.pdf
    • https://cdn.shopify.com/s/files/1/0431/3504/1702/files/93478279020.pdf
    • https://cdn.shopify.com/s/files/1/0429/5308/0985/files/23010356978.pdf
    • https://cdn.shopify.com/s/files/1/0437/0300/9430/files/43266217897.pdf
    • https://cdn.shopify.com/s/files/1/0428/3524/7271/files/favezaduduta.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4977/files/62913485048.pdf
    • https://cdn.shopify.com/s/files/1/0431/3156/8290/files/63052452901.pdf
    • https://static.usrfiles.com/ugd/b8c837_636df3f81567434b8f96819371890238.pdf
    • https://static.usrfiles.com/ugd/b8c837_35695968fed741b7abf77f63de221c93.pdf
    • https://static.usrfiles.com/ugd/b8c837_1f022ecf139f491995cd4ceceae10c07.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/
    • https://cdn.shopify.com/s/files/1/0429/8627/4977/files/62913485048.pd

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008d1b.bin
a804ecf081ccc51da1cb393b6ccce75b02802338b5e45a131d6ca9801604e1a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D1B 5212 bytes
font_01_sfnt_off00009ed0.bin
41b61f81d82426da5d7015e7dbf6119cc379420ef540b44280002922bd239d56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9ED0 11068 bytes

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