Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eb4163ca8ed6cdc…

MALICIOUS

PDF

45.2 KB Created: 2020-09-07 00:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6e267b77e34b750aff1db7506dffebb SHA-1: f867cc7b0356a068e894cb4b86d5c1fba1e4f3df SHA-256: 5eb4163ca8ed6cdc7787961ed8ac5cd564f56401fd8712d92d9a24c34da86707
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL that is likely intended to trick the user into clicking it. The PDF also contains a link farm, suggesting an attempt to manipulate search engine results or distribute content widely. The ML classifier strongly flagged this PDF as malicious.

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=brinks+keypad+door+lock+manual
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/74e905_751427c73ef74a6d9315b47c99f4b3d3.pdf
    • https://static.usrfiles.com/ugd/63f22d_bfa7775e50f141bca26125200bb907dc.pdf
    • https://static.usrfiles.com/ugd/9b7d8a_fdfbb6ec3e3044daabf9954b10b35861.pdf
    • https://static.usrfiles.com/ugd/d01287_a420fa343bed4563beb914a70c6626e6.pdf
    • https://cdn.shopify.com/s/files/1/0430/3945/7431/files/retail_trends_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/5488/3231/files/actuadores_electricos_y_electronicos.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/5989/files/35512516253.pdf
    • https://cdn.shopify.com/s/files/1/0450/9014/4421/files/didadabedijetotorasajuj.pdf
    • https://cdn.shopify.com/s/files/1/0430/9306/5877/files/quadratic_equation_examples.pdf
    • https://cdn.shopify.com/s/files/1/0435/5093/3156/files/92775348626.pdf
    • https://cdn.shopify.com/s/files/1/0430/7710/7865/files/resume_writing_samples.pdf
    • https://cdn.shopify.com/s/files/1/0436/8737/9094/files/beyond_diet_book.pdf
    • https://cdn.shopify.com/s/files/1/0443/9366/0582/files/full_nfl_schedule_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/2100/1119/files/ririjudakukixab.pdf
    • https://cdn.shopify.com/s/files/1/0460/9064/9764/files/gantz_manga.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006487.bin
a455db9b9b930e32105ac94889aecd980240cc6040cebe5b55bba258f7c23ffd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6487 5236 bytes
font_01_sfnt_off00007633.bin
396b4a629001634f4328e02dc9f41828904da867f427d2679c5f30c65395c119		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7633 10364 bytes
font_02_sfnt_off000099a9.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99A9 4324 bytes

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