Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38c3b7726ae5285…

MALICIOUS

PDF

45.2 KB Created: 2020-08-12 01:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c3f345d2cbdc083a301bc97ced6064a SHA-1: d1295544ae30898c912657126faff27bffb9c68d SHA-256: b38c3b7726ae52851b1522bc476c59a8fa8b841f9c9af917e5abfe15ca222da7
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=simplifying+variable+expressions+worksheet+pdf', which is flagged as malicious. The presence of a mass external PDF link farm further supports the malicious intent, aiming to drive traffic to potentially harmful sites.

Heuristics 3

  • 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.
  • 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=simplifying+variable+expressions+worksheet+pdf
    • http://dadaxero.kasrakaviani.com/uploads/1/3/2/6/132681556/raxepusajojavex-lubusukinu.pdf
    • http://files.peterbellinghamillustration.com/uploads/1/3/0/7/130775320/binuranirajagosu.pdf
    • http://fomif.mapleridgechristmasfestival.com/uploads/1/3/1/4/131453284/4f00340a202.pdf
    • http://files.cffu.org/uploads/1/3/2/6/132683111/bazakekukaxatiwi.pdf
    • http://files.milfordmagic.com/uploads/1/3/0/8/130814208/610041ea.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/palafasejuzanuz.pdf
    • https://cdn.shopify.com/s/files/1/0432/5244/9444/files/tixajemusafelolad.pdf
    • https://cdn.shopify.com/s/files/1/0432/6939/0500/files/pravana_chromasilk_color_chart.pdf
    • https://cdn.shopify.com/s/files/1/0433/9564/5589/files/vetabuxebolajuvorujurawuj.pdf
    • https://cdn.shopify.com/s/files/1/0434/8638/0197/files/etiologia_de_la_diabetes_mellitus.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/pujobizunedubonas.pdf
    • https://cdn.shopify.com/s/files/1/0429/9862/8501/files/64245793794.pdf
    • https://cdn.shopify.com/s/files/1/0430/5531/7149/files/59666413533.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32506959796.pdf
    • https://cdn.shopify.com/s/files/1/0440/7322/2294/files/roxozepo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7433/0517/files/gutuzifirivibo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0726/2367/files/48205080230.pdf
    • https://cdn.shopify.com/s/files/1/0431/1433/2309/files/kosopapexufokitufone.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_off00006609.bin
dd85b7a5ab6899a76bcc87f9abfbde32d30b9bac8c6f1db0093e9346dfff56e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6609 6084 bytes
font_01_sfnt_off00007aa5.bin
c9a2c9e58ddd6e39e0e12f2d2a9ce01ec5f13939c498300ab6466c0b528f8250
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AA5 14444 bytes