Malicious PDF — malware analysis report

Static analysis result for SHA-256 968338b87e43ca7b…

MALICIOUS

PDF

42.1 KB Created: 2020-08-13 00:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f216f6fcb69445cc407e55a409b841bc SHA-1: 982c688c24a5d104cc1843516818455b7ab6dcfe SHA-256: 968338b87e43ca7b5abcc5d985d40f5c22bd6c548868a6e6ce8d1f15c54915b3
152 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. Additionally, the 'PDF_SEO_LINK_FARM' heuristic indicates a large number of outbound links, many hosted on Shopify, suggesting an attempt to manipulate search results or distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF. The primary attack vector appears to be luring users to malicious infrastructure via deceptive links within the document.

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.ru/wb?keyword=placental%20grading%20pdf
    • http://files.spicepeppergarden.com/uploads/1/3/1/4/131438137/jugim-rezurawebogatar-bexudojekav.pdf
    • http://tavuxuna.financewebapps.com/uploads/1/3/2/7/132712253/4231662d.pdf
    • http://vujevop.chromeangelzrcnationals.com/uploads/1/3/1/8/131856772/7a4f3e03ed0321.pdf
    • http://ginonu.rmbc.edu/uploads/1/3/1/4/131437823/57de3c.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lufixupiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/9105/9097/files/71497313610.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71062637782.pdf
    • https://cdn.shopify.com/s/files/1/0432/1817/4120/files/acca_f3_study_notes.pdf
    • https://cdn.shopify.com/s/files/1/0432/5723/3576/files/vaditoforuxexatunemi.pdf
    • https://cdn.shopify.com/s/files/1/0427/6856/4380/files/29094359156.pdf
    • https://cdn.shopify.com/s/files/1/0440/8007/0821/files/52593326893.pdf
    • https://cdn.shopify.com/s/files/1/0430/3588/5725/files/jawolenizizusadagulifusup.pdf
    • https://cdn.shopify.com/s/files/1/0433/8404/5719/files/sulezawovidurojalijibedeb.pdf
    • https://cdn.shopify.com/s/files/1/0433/1231/6584/files/95290717087.pdf
    • https://cdn.shopify.com/s/files/1/0436/6853/7497/files/nupubejibuzujixibiwiku.pdf
    • https://cdn.shopify.com/s/files/1/0431/2940/5600/files/72584257945.pdf
    • https://cdn.shopify.com/s/files/1/0430/5335/1066/files/robert_lanza_biocentrismo.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_off00005ffa.bin
4126c3bb65ae257f017263a9f847d422ae38313ce799bcb32996911b024f799f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FFA 5148 bytes
font_01_sfnt_off0000717e.bin
7c005068f5e16c5c807680e1c8fb905a9e75ed5a87d25ebabd8a989c7fa18cc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x717E 12844 bytes

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