Malicious PDF — malware analysis report

Static analysis result for SHA-256 b029120cc4aeee59…

MALICIOUS

PDF

65.7 KB Created: 2020-08-25 03:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0ed00c673a73065ee0455249290c145 SHA-1: 917e43e8d929b746596462cddbb51784341a20af SHA-256: b029120cc4aeee59e0e84dfdf18fbadf514003c506460acf764d42246b724c2f
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.com) that is known to host malicious content. The document body, though heavily obfuscated, contains references to 'Microsoft access templates for manufacturing' and the redirector URL, suggesting a lure to entice users to click the malicious links. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=microsoft+access+templates+for+manufacturing
    • http://files.alebml.com/uploads/1/3/2/6/132681647/8464764.pdf
    • https://cdn.shopify.com/s/files/1/0437/6693/9799/files/pawopikutogolofolomad.pdf
    • https://cdn.shopify.com/s/files/1/0431/4185/7448/files/25337320158.pdf
    • https://cdn.shopify.com/s/files/1/0432/3078/9800/files/absorbing_markov_chain.pdf
    • https://cdn.shopify.com/s/files/1/0428/2017/3983/files/acca_f2_notes_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/7713/9613/files/nowavasokad.pdf
    • https://cdn.shopify.com/s/files/1/0439/3975/8235/files/nadifigemapabov.pdf
    • https://cdn.shopify.com/s/files/1/0439/4654/1211/files/xusufakelirizulojexet.pdf
    • https://cdn.shopify.com/s/files/1/0435/4713/2063/files/gate_2020_mechanical_engineering_syllabus_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/5097/5910/files/20968575415.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_off0000bd64.bin
1ca35d18582ff0cf023f3d2e616c4fcc7a97bf56b440e4d2e88eefb8651e6544		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD64 5340 bytes
font_01_sfnt_off0000cf7b.bin
4addb1487e15652f66b7594e484b4a236a08dba2c66495b298834d3125a85fe0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7B 13704 bytes

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