Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f55f1c20414279e…

MALICIOUS

PDF

150.4 KB Created: 2020-08-11 17:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb915720a29e385688022d47c0518f18 SHA-1: 67a2b0dc9b11eaf1a15f74308b054ef2d6c274a6 SHA-256: 4f55f1c20414279ed2b1c67fc83907964cadc2e2f4a1061124b40ccdae7cea1e
92 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same URL. The ML classifier also flagged this PDF with high confidence. The primary attack vector appears to be luring the user to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=short+biography+of+nelson+mandela+pdf
    • http://files.orchidbehavioralcare.com/uploads/1/3/1/6/131607010/kixufagobito.pdf
    • http://files.anniecordes.com/uploads/1/3/2/3/132302733/7482853.pdf
    • http://zitako.piratehighwire.com/uploads/1/3/2/3/132303064/8678528.pdf
    • http://files.albemarleallotments.org.uk/uploads/1/3/1/6/131606819/2b7c9.pdf
    • https://cdn.shopify.com/s/files/1/0431/6125/6096/files/28245873175.pdf
    • https://cdn.shopify.com/s/files/1/0430/2707/1127/files/69721674753.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9489/files/tituganomufutalu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6448/2202/files/pitul.pdf
    • https://cdn.shopify.com/s/files/1/0432/9072/2454/files/lasepilusun.pdf
    • https://cdn.shopify.com/s/files/1/0434/5148/2278/files/6026492331.pdf
    • https://cdn.shopify.com/s/files/1/0445/8138/8452/files/animals_and_their_homes_worksheets_for_grade_1.pdf
    • https://cdn.shopify.com/s/files/1/0433/2371/9845/files/67110197506.pdf
    • https://cdn.shopify.com/s/files/1/0430/0311/7721/files/32883659398.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jakenetukuzalavat.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_off00020f96.bin
90b3343bbf04a7ec90cfca8779c45cc586dc6cd08a2edbdaa7c856600fbb36be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20F96 5800 bytes
font_01_sfnt_off00022329.bin
884f40b6ef3dfcfda601a45ccf07e1b071d98e2e3925af548e9a856f75c48fad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x22329 12016 bytes

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