Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ced12f4228327b…

MALICIOUS

PDF

49.2 KB Created: 2020-09-02 21:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fd2e9c779f206f9cdb887217f01c096 SHA-1: fc044b8ebc4df8be845d05912feea0bfd9ee71a3 SHA-256: f4ced12f4228327bb1ff88b5b320413ca0475a337fcfbb4f2d85116bc4186847
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to Shopify domains hosting other PDFs, which is indicative of a link farm. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.cc/wix?keyword=las-+ketchup-+asereje+song+free'. The document body, though heavily obfuscated, contains this same redirector URL and several benign-looking Shopify PDF links, suggesting a lure to a malicious site disguised as a collection of documents.

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/wix?keyword=las-+ketchup-+asereje+song+free
    • https://cdn.shopify.com/s/files/1/0438/1786/1277/files/24041622034.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/diboguzudamafixirunu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/70282461387.pdf
    • https://static.usrfiles.com/ugd/b8c837_598d6818cebb42b9a47e2967aa1b1525.pdf
    • https://static.usrfiles.com/ugd/b8c837_901166200ca84c9492832501ae1e2cc4.pdf
    • https://static.usrfiles.com/ugd/ee9d3f_efc5ceebaa1a42b28a8e28b7b2c25193.pdf
    • https://static.usrfiles.com/ugd/e5a943_d3f55af1071646c2b36d4acdd3bb7d42.pdf
    • https://cdn.shopify.com/s/files/1/0432/9170/5500/files/30352039741.pdf
    • https://cdn.shopify.com/s/files/1/0434/1887/8114/files/ignou_assignment_submission_slip.pdf
    • https://cdn.shopify.com/s/files/1/0437/6880/7586/files/broiler_chickens.pdf
    • https://cdn.shopify.com/s/files/1/0431/1708/4833/files/53598406384.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064fe.bin
5e7162c2282eb08e4fb59db53e40f1e87c9ad67ed684c4751362a7934e93f862
pdf-font-stream PDF embedded font (sfnt) at offset 0x64FE 5356 bytes
font_01_sfnt_off00007749.bin
f364145c6c55dc11597f128ac6f998eebeaf545db02c0abcde9344339b1b5bd9
pdf-font-stream PDF embedded font (sfnt) at offset 0x7749 9728 bytes
font_02_sfnt_off000098d1.bin
dabf0ccc451caf4864c9b22ca91318a92e8f625b469dd0561edf59b451c7a792
pdf-font-stream PDF embedded font (sfnt) at offset 0x98D1 18776 bytes