Malicious PDF — malware analysis report

Static analysis result for SHA-256 761791bba1efc6a9…

MALICIOUS

PDF

40.7 KB Created: 2020-08-15 18:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0198216a5aa3586281e99a732296a722 SHA-1: a421a026de58a5dd9c308bfa6bdb27ccb5ab3f98 SHA-256: 761791bba1efc6a9afbf9aefa253e0c098982eef7a0d0a58df6565a983dffd76
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a malicious redirector link, suggesting the document is designed to lead users to harmful websites. The document body, though heavily obfuscated, contains text related to instructions and worksheets, aligning with the link farm's deceptive purpose. No scripts were extracted from this sample.

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.cc/wb?keyword=can%20you%20follow%20instructions%20worksheet
    • http://files.bonneygirlphotography.com/uploads/1/3/2/6/132681204/sapoxorufewodod.pdf
    • http://jisafi.imaginerespiteservices.com/uploads/1/3/2/3/132303382/favuwujumewi_buzorusube.pdf
    • http://files.dremilyortho.com/uploads/1/3/0/7/130776043/5620374.pdf
    • http://dogot.oakhillsoregon.com/uploads/1/3/1/4/131410685/larakogegov.pdf
    • https://cdn.shopify.com/s/files/1/0430/7864/7957/files/732188106.pdf
    • https://cdn.shopify.com/s/files/1/0428/1496/3868/files/17788394673.pdf
    • https://cdn.shopify.com/s/files/1/0437/6097/6021/files/wifezolovafadifituwebej.pdf
    • https://cdn.shopify.com/s/files/1/0431/0351/8882/files/nejelujufinukedikoledex.pdf
    • https://cdn.shopify.com/s/files/1/0433/3905/5258/files/6726267484.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kofuf.pdf
    • https://cdn.shopify.com/s/files/1/0429/3227/3319/files/fabudedavi.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/wodomenuxonixesawiporoz.pdf
    • https://cdn.shopify.com/s/files/1/0429/5314/6517/files/xaxifaxokux.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_off000061f0.bin
cde86429e75776c10c37942d561fceef7ec66330626eecfd935ac3dc0bf14013		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61F0 5132 bytes
font_01_sfnt_off00007381.bin
cc5261a3c57ea55328f7f9220a02c8d0e96f78d880102169c70550fa59455e10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7381 10084 bytes

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