Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5a538b31a509616…

MALICIOUS

PDF

55.4 KB Created: 2020-08-03 11:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b808bcb46fdc05c8e2fef720894eab62 SHA-1: 7d117312b1c960cd1fc55db4a4619c1f084d0a8f SHA-256: d5a538b31a50961628e7da01f720e695dad85f4f56e91d3604bc888f42d742b8
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to an English vocabulary test and includes the malicious URL. This suggests a phishing or scam attempt where the user is lured to a malicious site under the guise of an educational resource. No scripts were extracted, limiting the analysis of further execution chains.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.ru/pify?keyword=english+vocabulary+test+for+beginners+pdf
    • http://files.dreamplanitevents.com/uploads/1/3/1/8/131871687/8614148.pdf
    • http://files.mrober.com/uploads/1/3/0/7/130738554/3944755feaa.pdf
    • http://kitawaw.stephanieparadiso.com/uploads/1/3/0/8/130874474/runuxewigufedikitako.pdf
    • https://cdn.shopify.com/s/files/1/0431/8376/7713/files/anime_girl_running.pdf
    • https://cdn.shopify.com/s/files/1/0432/4481/4500/files/wotododoma.pdf
    • https://cdn.shopify.com/s/files/1/0436/0005/2387/files/bomeme.pdf
    • https://cdn.shopify.com/s/files/1/0428/5533/4055/files/luvasomelosokib.pdf
    • https://cdn.shopify.com/s/files/1/0434/3654/0069/files/melezepilefijowubi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0058/5632/files/sefimuzi.pdf
    • https://cdn.shopify.com/s/files/1/0435/4244/6231/files/html_document_template.pdf
    • https://cdn.shopify.com/s/files/1/0432/9635/8565/files/try_food_lovers_review.pdf
    • https://cdn.shopify.com/s/files/1/0434/3077/2901/files/gefalesiveziwugarenebatij.pdf
    • https://cdn.shopify.com/s/files/1/0434/4525/6344/files/bokaravopot.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_off00008bf4.bin
0e63dae16f1fe2f91d272f57283002f3f1cbd591799198d71e7a17d5b3a84484		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BF4 5560 bytes
font_01_sfnt_off00009ed4.bin
eb023d38af019e161514d0d45f8efb0e3ef8aa25c9e1faa25fae498603d4b300		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9ED4 10476 bytes
font_02_sfnt_off0000c2a9.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A9 4324 bytes

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