Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ad262a864610607…

MALICIOUS

PDF

33.9 KB Created: 2020-09-01 02:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33fa28b4b979d6cbe5ce00e9f00176b3 SHA-1: 9ea779d8fc0abf6d6c745e015d21d1c3333cee60 SHA-256: 2ad262a864610607ff4b81e8aff398ff3bfbf7a7b28b815b67a99dbc8ad4a2c9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning model and heuristics indicate it is a malicious redirector and a link farm. The primary malicious IOC is a URL pointing to known malicious infrastructure, which is likely intended to lead the user to a phishing or malware download site. The document body contains numerous links to other PDF files hosted on Shopify, likely as part of an SEO-based link farm to obscure the malicious redirect.

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=you+are+the+reason+sheet+music+satb
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/talijofazejodo.pdf
    • https://cdn.shopify.com/s/files/1/0461/5539/9331/files/geometric_probability_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0430/7802/5370/files/ionising_radiation_risk_assessment_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/xiwijaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/6875/0998/files/tamamulesawemevikijesisum.pdf
    • https://cdn.shopify.com/s/files/1/0431/4349/5842/files/find_duplicate_rows_in_excel_spreadsheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/4624/8358/files/95342646812.pdf
    • https://cdn.shopify.com/s/files/1/0436/5415/2342/files/merejililupoxa.pdf
    • https://cdn.shopify.com/s/files/1/0434/5869/1232/files/ventilator_associated_pneumonia_prevention.pdf
    • https://cdn.shopify.com/s/files/1/0432/1322/6152/files/48150728603.pdf
    • https://cdn.shopify.com/s/files/1/0438/9529/2059/files/cordially_invited.pdf
    • https://cdn.shopify.com/s/files/1/0433/9141/8518/files/ranoworox.pdf
    • https://static.usrfiles.com/ugd/45e30f_a73d00b138e34780a292e7aabbf758fb.pdf
    • https://static.usrfiles.com/ugd/4c76bf_37a7737955e34567aef1a6c56f3f9875.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_off00004725.bin
ed532d919b8d9c3b9fa5623ef48cda6dd3fc93928cf7c59d992b41eaf14c0bed
pdf-font-stream PDF embedded font (sfnt) at offset 0x4725 5108 bytes
font_01_sfnt_off0000585a.bin
b70ff9b0c571e831e5a26f657a1d5354bccb0475d257f704c40b13ccf4b5c93e
pdf-font-stream PDF embedded font (sfnt) at offset 0x585A 10164 bytes