Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed790f06a8fba6af…

MALICIOUS

PDF

35.0 KB Created: 2020-08-14 09:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9cf823808f0d07946d63c2fa40e956f4 SHA-1: 996c51e4219970437cbebfd93fae628c40849c5c SHA-256: ed790f06a8fba6af188b0e95f06ef02f68c3e81ac97b43fb5d9d6601e0ab3b45
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL, suggesting the primary intent is to lure the user to a compromised site. 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/pify?keyword=music+box+dancer+piano+duet+sheet+music
    • http://files.emeraldbeachpizzapasta.com.au/uploads/1/3/2/7/132741385/2450053.pdf
    • http://files.usmbarlab.com/uploads/1/3/1/4/131437402/zexulipetisu_fuzipawubek.pdf
    • http://kibafi.sfcentralsda.org/uploads/1/3/1/3/131383483/2250fc7cd079.pdf
    • http://files.antstrategic.com/uploads/1/3/0/9/130969944/9080154.pdf
    • https://cdn.shopify.com/s/files/1/0430/8484/1124/files/bumunezavirirexigos.pdf
    • https://cdn.shopify.com/s/files/1/0431/0089/7440/files/34302189239.pdf
    • https://cdn.shopify.com/s/files/1/0432/0913/0143/files/3ds_max_glass_material.pdf
    • https://cdn.shopify.com/s/files/1/0437/3010/8577/files/67574865954.pdf
    • https://cdn.shopify.com/s/files/1/0435/5732/2903/files/maple_hunter_decals.pdf
    • https://cdn.shopify.com/s/files/1/0433/4757/4949/files/lukiw.pdf
    • https://cdn.shopify.com/s/files/1/0427/5961/8716/files/suxijamajivepifev.pdf
    • https://cdn.shopify.com/s/files/1/0430/0577/1939/files/28764866308.pdf
    • https://cdn.shopify.com/s/files/1/0431/6885/8280/files/1448698275.pdf
    • https://cdn.shopify.com/s/files/1/0437/3718/6458/files/business_english_grammar_lessons.pdf
    • https://cdn.shopify.com/s/files/1/0433/8050/6791/files/xujikokerekoredamavaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/budexojimomamuzarumedi.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_off00004a2b.bin
71f1cfaf0361716b95467c794f1fa570ebddcb41edd2df9ed079a4bb25eb5910		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A2B 5496 bytes
font_01_sfnt_off00005ca8.bin
5591213dbebf9b69f6707e26f78a950fafaf08fe300af376dcca2d8d1dd2aa87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CA8 10144 bytes

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