Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e3db3cb8863a9b0…

MALICIOUS

PDF

39.4 KB Created: 2020-08-02 22:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f711f3144caef7fc3aab1db7ca1bee5b SHA-1: 56f493a4116578ddd5ef9a27bbaa98c02bbcd40a SHA-256: 0e3db3cb8863a9b0cbac9298890366ea74e2d7c8a8acce391d872d11ebf6e9f3
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a heuristic firing for a malicious redirector link and a browser extension installation lure, indicating a social engineering attempt. The document body, though obfuscated, contains a URL that is also flagged as a malicious redirector. The presence of numerous embedded links, many pointing to PDF files on Shopify, suggests a link farm used to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=chrome+full+screen+mac
    • http://files.seahillfarm.com/uploads/1/3/1/6/131636828/9f2bae83426.pdf
    • http://files.lymefilm.org/uploads/1/3/0/8/130873945/4072913.pdf
    • http://files.affiliatedtattoofamily.com/uploads/1/3/0/8/130814921/962443.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8032/7076/files/somorifuze.pdf
    • https://cdn.shopify.com/s/files/1/0432/6978/3720/files/68198167783.pdf
    • https://cdn.shopify.com/s/files/1/0433/5042/5753/files/22763463149.pdf
    • https://cdn.shopify.com/s/files/1/0437/3797/2897/files/rekuvi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7764/0092/files/42690913328.pdf
    • https://cdn.shopify.com/s/files/1/0428/5110/6972/files/nexukojumi.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5082/files/1196683846.pdf
    • https://cdn.shopify.com/s/files/1/0437/3217/2965/files/kejubali.pdf
    • https://cdn.shopify.com/s/files/1/0430/2408/9242/files/55103962609.pdf
    • https://cdn.shopify.com/s/files/1/0448/0575/0946/files/how_to_strikethrough_in_discord.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_off00005e63.bin
4d23e215afe626c856a391fef24cff9bbbbe1b33119854eb7b203372372d0447		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E63 5024 bytes
font_01_sfnt_off00006f48.bin
a309e9d3ba4a55f11d77ce44b8be1953cfd277a457c83402df3015e058b0ef83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F48 9920 bytes

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