Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2ca46b64c8519fa…

MALICIOUS

PDF

40.4 KB Created: 2020-08-12 20:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1145f4c540541aba8c35360e0ed7221 SHA-1: b3a0d49a726d4a07920d64c1384e747fb88b7d01 SHA-256: e2ca46b64c8519fa84913241fb5a8f96aeba57ed9685eb401cf814678c2782a5
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a link to an educational PDF. The document body itself is heavily obfuscated but contains references to the redirector URL and numerous other URLs hosted on Shopify and other file-sharing services, likely as part of a link farm to improve search engine ranking and distribute the malicious payload. The ML classifier strongly indicated maliciousness.

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.com/pify?keyword=the+handbook+of+bilingual+and+multilingual+education+pdf
    • http://files.jstello.com/uploads/1/3/1/0/131069812/kuvas.pdf
    • http://files.theelementsexchange.com/uploads/1/3/1/0/131071157/tagadom.pdf
    • http://files.shireendamghani.com/uploads/1/3/0/7/130739419/2115747.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/76222514852.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/632816095.pdf
    • https://cdn.shopify.com/s/files/1/0435/8648/6440/files/gixumerevup.pdf
    • https://cdn.shopify.com/s/files/1/0431/3382/9277/files/45296647622.pdf
    • https://cdn.shopify.com/s/files/1/0429/0733/6857/files/37719589523.pdf
    • https://cdn.shopify.com/s/files/1/0431/2793/1046/files/21017642794.pdf
    • https://cdn.shopify.com/s/files/1/0431/5981/4306/files/tekovon.pdf
    • https://cdn.shopify.com/s/files/1/0430/4925/5061/files/99839351400.pdf
    • https://cdn.shopify.com/s/files/1/0432/1473/3480/files/xijasefujasinelefa.pdf
    • https://cdn.shopify.com/s/files/1/0429/7742/7609/files/23385330122.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/91025233068.pdf
    • https://cdn.shopify.com/s/files/1/0432/7312/6052/files/borland_pascal.pdf
    • https://cdn.shopify.com/s/files/1/0434/2880/6807/files/simple_past_tense_exercises_for_beginners.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_off00005e5a.bin
37386eb4cc412d9418a45000a7b20dce64db56ae33e8f8ce1c4bb8181a2f631b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E5A 5448 bytes
font_01_sfnt_off000070bc.bin
794d6dc681596eff794805ee5a70dd1f4323b7bcb6b96e9b4e11b6269d873dda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70BC 10444 bytes

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