Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee22e4a7562c630a…

MALICIOUS

PDF

54.1 KB Created: 2020-09-18 17:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20185386597935fb188694e9069987a8 SHA-1: 172aabd9ed7369d1b0fdf1f3ec1e463d56f8918a SHA-256: ee22e4a7562c630a5b67105decb39116a9c66d6cf53ec940087afb47212cbf3a
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.link/wix?keyword=1903a3+smith+corona'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious redirector URL and several benign-looking PDF links, suggesting a lure to external content.

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.link/wix?keyword=1903a3+smith+corona
    • https://cdn.shopify.com/s/files/1/0429/2660/4447/files/16809851912.pdf
    • https://cdn.shopify.com/s/files/1/0431/6423/7992/files/sepixegifijebakowuzux.pdf
    • https://cdn.shopify.com/s/files/1/0429/8830/6586/files/advanced_root_checker_apk_free.pdf
    • https://cdn.shopify.com/s/files/1/0440/8904/9238/files/74275644226.pdf
    • https://7d828783-7b2c-46dc-b5cb-be3e9b3f01a3.filesusr.com/ugd/e2f7e1_7ed953f162c34b19b5c92bceabf5fe83.pdf?index=true
    • https://a5f165dd-e5cf-49e9-9b42-912bf75cecbe.filesusr.com/ugd/8127dd_40548410d4ad4f3d9996f2cfdba93612.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0429/2139/4343/files/revan_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/8960/8360/files/science_experiment_report_sample.pdf
    • https://cdn.shopify.com/s/files/1/0461/7489/6281/files/60386250157.pdf
    • https://cdn.shopify.com/s/files/1/0433/7578/8190/files/ca_medical_license_renewal_form.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_off000095de.bin
9dac2b6cba299ccc7f50a65f65029535fba66c4be7780d8f3a37c27ff6290601
pdf-font-stream PDF embedded font (sfnt) at offset 0x95DE 5424 bytes
font_01_sfnt_off0000a82a.bin
f50b26c2a2ce05c2ceffe7dec087186855e9f54d271109c79094ce5182ebc8d8
pdf-font-stream PDF embedded font (sfnt) at offset 0xA82A 10580 bytes