Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4bd0d980e959ca…

MALICIOUS

PDF

38.0 KB Created: 2020-08-14 23:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a28bfa61ba38aa4b01637f65df272092 SHA-1: 5dfc13df4f6fdd1a1204eae7267a0c3fbbb9807a SHA-256: ca4bd0d980e959ca8bc1e99b88582b72b206a91947b506ae820c1b5d440e54a1
150 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the primary malicious URL. The ML classifier also strongly indicated maliciousness. 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.com/wb?keyword=latanoprost%20ophthalmic%20davis%20pdf
    • http://files.bereabaptistdurham.org/uploads/1/3/2/7/132710603/saguxakolofavak.pdf
    • http://files.skski.net/uploads/1/3/0/8/130814596/b3bf4.pdf
    • https://cdn.shopify.com/s/files/1/0430/2418/7549/files/lezulunozofejojetusar.pdf
    • https://cdn.shopify.com/s/files/1/0441/3367/9256/files/zotiliborekadesifewenezef.pdf
    • https://cdn.shopify.com/s/files/1/0440/1322/4094/files/2869259559.pdf
    • https://cdn.shopify.com/s/files/1/0452/3904/2205/files/antigona_furiosa_libro.pdf
    • https://cdn.shopify.com/s/files/1/0437/3096/0549/files/sutivarevimatabosikutaboj.pdf
    • https://cdn.shopify.com/s/files/1/0429/3633/6551/files/vigotofixugofunopomit.pdf
    • https://cdn.shopify.com/s/files/1/0433/8896/0933/files/dialysis_procedure.pdf
    • https://cdn.shopify.com/s/files/1/0432/3957/1611/files/active_and_passive_voice_mcqs_test.pdf
    • https://cdn.shopify.com/s/files/1/0434/1088/2716/files/tenets_of_africana_womanism.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_off000057b9.bin
abb9b8ab932cde3cf3941a705160a2a37d0462e79b603f2bae4be311a2718966		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57B9 5396 bytes
font_01_sfnt_off000069e6.bin
59c433f7142712f59b4d075fcc8e3273c107e9126a80cfd2fba223a8abb49be2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69E6 9904 bytes

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