Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e420e343c3dfaa…

MALICIOUS

PDF

43.7 KB Created: 2020-08-27 23:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96eff14d374016e8c96397aaec2ef7a2 SHA-1: 73aab3a32a5078f13fd9f180cc7e9f06337c6bf5 SHA-256: a1e420e343c3dfaa696f583fea8c69488100f06d688634902d8de30d552a5770
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.ru, disguised as a search result for TV remote codes. This heuristic, combined with the ML classifier flagging the PDF as malicious, strongly suggests a phishing or social engineering attack. The document body, though heavily obfuscated, contains the same URL, reinforcing the malicious intent. No scripts were extracted, limiting the analysis of further stages.

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=rca+universal+remote+codes+for+sharp+tv
    • http://ritusigid.runninonfaithtc.org/uploads/1/3/0/7/130775358/7634734.pdf
    • http://files.grimoirequest.com/uploads/1/3/1/1/131163561/decc44b00bf472.pdf
    • https://cdn.shopify.com/s/files/1/0432/1129/2827/files/87160288717.pdf
    • https://cdn.shopify.com/s/files/1/0450/2241/2958/files/equilibrium_economics.pdf
    • https://cdn.shopify.com/s/files/1/0432/5415/3371/files/ielts_speaking_practice_questions.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/7265663215.pdf
    • https://cdn.shopify.com/s/files/1/0430/3667/2162/files/pivamebodurewofamozax.pdf
    • https://cdn.shopify.com/s/files/1/0433/8126/0440/files/rubekebemowuweta.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4939/files/gezomixopiwetebuv.pdf
    • https://cdn.shopify.com/s/files/1/0437/2289/9608/files/legal_services_contract_template.pdf
    • https://cdn.shopify.com/s/files/1/0435/5093/3156/files/zodejodevupikosur.pdf
    • https://cdn.shopify.com/s/files/1/0434/0075/7398/files/imperative_verbs_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/8188/3030/files/zoxefavogojugumaso.pdf
    • https://cdn.shopify.com/s/files/1/0431/2462/1473/files/bilirenowome.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_off00006e4e.bin
5f4637e6a2109a5dcb15b35661c23d47e8ee7023bfc0448c28550254c77093e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E4E 5460 bytes
font_01_sfnt_off000080c2.bin
c55cba5c3149b826bf7060bc2405fc3dfd3072a44ff388db70afef4a682c8025		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80C2 9680 bytes

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