Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b99d24c2753325…

MALICIOUS

PDF

42.6 KB Created: 2020-08-31 21:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af7aa727c5fa6932967f5c20849a969b SHA-1: 04a1e37a493ccc9d2d46f06e7883d51d2142cdbe SHA-256: 11b99d24c2753325bb7b8fbe5b577c3a7f9b7f415ad0d1260a61b8ede722ec6e
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains multiple heuristics indicating malicious intent, including a link to a known malicious redirector and a lure to install a browser extension or update. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/wix?keyword=best+adblock+for+android+box, which is flagged as a malicious redirector. This suggests the PDF is designed to trick users into visiting malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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/wix?keyword=best+adblock+for+android+box
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/9105/7058/files/92214305622.pdf
    • https://cdn.shopify.com/s/files/1/0435/1049/7434/files/dbs_check_address_continuation_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0464/4854/1864/files/81741355757.pdf
    • https://cdn.shopify.com/s/files/1/0460/1924/8295/files/axis_and_allies_miniatures_rules.pdf
    • https://cdn.shopify.com/s/files/1/0431/7439/6063/files/walumevupeme.pdf
    • https://cdn.shopify.com/s/files/1/0437/8053/8529/files/casual_encounter_nyc.pdf
    • https://cdn.shopify.com/s/files/1/0434/8179/2664/files/gitotolixezakiteposi.pdf
    • https://cdn.shopify.com/s/files/1/0440/5687/1062/files/zazufivomowogitebutoser.pdf
    • https://cdn.shopify.com/s/files/1/0439/1724/6632/files/36675662144.pdf
    • https://cdn.shopify.com/s/files/1/0434/1137/4230/files/input_type_file_allow_only.pdf
    • https://cdn.shopify.com/s/files/1/0434/6282/0005/files/wedewepopugus.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067fa.bin
0919c75a7e880c2bbac44d2e60d6f1b0ae1af630a156ac1ee994a61622099af0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67FA 5336 bytes
font_01_sfnt_off00007a37.bin
fd3cef1655b4bb514e5c15d66a7de4a77df67fa54980d452a0a69a83c6907047		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A37 10304 bytes

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