Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1c2d9ef20fe5e0…

MALICIOUS

PDF

37.6 KB Created: 2020-09-19 05:41:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3fff40ac5841f96818bd099e314d1fa SHA-1: 0ea0409cd196f6cfb210349ff3ea9ea3eeb71879 SHA-256: 4a1c2d9ef20fe5e0802ac930fe39e54e8a83034f59434b32a50e78c42b69b653
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, identified as a PDF link farm. One critical heuristic indicates a malicious redirector link to 'https://ttraff.club/wix?keyword=non+proportional+graphs+worksheet'. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous external links suggests a campaign to drive traffic to malicious sites, potentially for phishing or SEO poisoning.

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.club/wix?keyword=non+proportional+graphs+worksheet
    • http://mazaw.forceofnaturehandhewnconstruction.ca/uploads/1/3/0/8/130874617/bukubu_barufemufa.pdf
    • http://files.propcustomz.com/uploads/1/3/1/4/131406275/8ce7138b17.pdf
    • http://nupewefu.isadaddy.com/uploads/1/3/2/6/132681885/6633640.pdf
    • http://dewivazuv.rogueartisanfoods.com/uploads/1/3/1/3/131397983/1788813.pdf
    • http://files.myswimplatform.com/uploads/1/3/1/4/131453917/34881e57a.pdf
    • http://files.joshuaduncanartist.com/uploads/1/3/2/7/132740700/e00ada7.pdf
    • http://jazovu.freedomk9s.com/uploads/1/3/2/6/132695818/jozigalugegepox.pdf
    • https://cdn.shopify.com/s/files/1/0430/1747/0101/files/menunutuked.pdf
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/71799200453.pdf
    • https://cdn.shopify.com/s/files/1/0437/0549/9803/files/84329445474.pdf
    • https://cdn.shopify.com/s/files/1/0433/9623/5415/files/le_journal_el_watan_d_aujourd_hui.pdf
    • https://cdn.shopify.com/s/files/1/0440/4789/2630/files/wetigaf.pdf
    • https://cdn.shopify.com/s/files/1/0465/2302/3518/files/valutulesariv.pdf
    • https://cdn.shopify.com/s/files/1/0428/4206/3004/files/killer_karl_krupp.pdf
    • https://cdn.shopify.com/s/files/1/0438/4414/1218/files/beautiful_disaster_series_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/7292/8409/files/cateye_velo_wireless_cc-_vt235w_manual.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_off000054ee.bin
7b5f1954391dc7eb85bd3561345448c4bcef041b017a805326734e9afff8cc07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54EE 5204 bytes
font_01_sfnt_off000066b4.bin
0e34d3f52240b468786b6b7c95b679e33a4babf015b358d24bae930c40b916ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66B4 10376 bytes

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