Malicious PDF — malware analysis report

Static analysis result for SHA-256 898f840a300c6fee…

MALICIOUS

PDF

38.0 KB Created: 2020-08-14 13:38:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2809bff619f4d3e02a0a8982239feb50 SHA-1: 4de0ef5ef38a695e616af6e198270139e35f5944 SHA-256: 898f840a300c6fee3c80414c5c8d9d7c844cd15058f1707ed21ad26f41073d9e
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is designed to lead users to malicious content. The document body, though obfuscated, contains the same URL and a reference to a PDF file hosted on Shopify, suggesting a lure to download further malicious content. The ML classifier strongly indicated maliciousness, and the PDF structure itself points to a link farm designed for SEO manipulation to distribute malicious PDFs.

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=i+love+u+my+angel+song
    • http://files.topsfieldkarateacademy.com/uploads/1/3/1/3/131379409/5523952.pdf
    • http://nafuwasa.gwenjbrewer.com/uploads/1/3/2/7/132710780/a2085bd9fa2df.pdf
    • http://files.360defensemartialarts.com/uploads/1/3/0/9/130969048/fekurisiwe-jopeni-gukaxuma.pdf
    • http://besexinex.daniellebegnaud.com/uploads/1/3/2/6/132682883/7883993.pdf
    • https://cdn.shopify.com/s/files/1/0433/5570/1398/files/rewebimiz.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/anesthesia_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/4192/9886/files/suwidoxizitexiwiketitud.pdf
    • https://cdn.shopify.com/s/files/1/0431/6132/1634/files/zilikuroroxaleza.pdf
    • https://cdn.shopify.com/s/files/1/0430/4912/3993/files/muwup.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7741/files/gezukerome.pdf
    • https://cdn.shopify.com/s/files/1/0435/8992/7067/files/advanced_cardiovascular_life_support_provider_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/9535/9642/files/69554906716.pdf
    • https://cdn.shopify.com/s/files/1/0436/0683/5358/files/luxesufiruzezo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0714/7166/files/naguloxel.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_off000053b6.bin
a8ca850b3af47973358c7718402be3b9c80e230dd9368bb4342dcb7ca3fdc427
pdf-font-stream PDF embedded font (sfnt) at offset 0x53B6 5008 bytes
font_01_sfnt_off000064be.bin
05e4875c83b050f1bbd9d1a06a8420ebe12caef102c76d3e93e13ecc7c1340db
pdf-font-stream PDF embedded font (sfnt) at offset 0x64BE 12072 bytes