Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f131ff1c20bb286…

MALICIOUS

PDF

57.0 KB Created: 2020-07-31 05:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c066e90bd7ff4296c3a98780753ad48b SHA-1: 2f2a6d4432f3a7eb6d7668a0c1f6fe01235d4e84 SHA-256: 1f131ff1c20bb286a49e3dc6d3fdedd8d7f2e15d222b0e33e7e72f2f68985a1c
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits a PDF SEO link farm pattern, embedding numerous links to other PDFs hosted on platforms like Shopify. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be luring users to malicious infrastructure via these embedded links.

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=an+occurrence+at+owl+creek+bridge+by+ambrose+bierce+pdf
    • http://files.claireannagarand.com/uploads/1/3/2/7/132712057/9415716.pdf
    • http://files.seattosleep.co.uk/uploads/1/3/2/6/132695418/1b7af.pdf
    • http://files.gavinwelshfarriery.co.nz/uploads/1/3/1/4/131409761/jobewirerujofafi.pdf
    • http://files.languageshield.com/uploads/1/3/0/8/130813921/5093218.pdf
    • http://files.stonecirclepress.com/uploads/1/3/2/6/132682585/5083095.pdf
    • https://cdn.shopify.com/s/files/1/0431/1462/7234/files/34437948167.pdf
    • https://cdn.shopify.com/s/files/1/0430/6753/9623/files/651014303.pdf
    • https://cdn.shopify.com/s/files/1/0429/5039/4019/files/31560336404.pdf
    • https://cdn.shopify.com/s/files/1/0432/9763/6512/files/46622656221.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/86477918810.pdf
    • https://cdn.shopify.com/s/files/1/0433/3309/1480/files/82421224328.pdf
    • https://cdn.shopify.com/s/files/1/0436/8737/9097/files/fomagibutavib.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5275/files/47781255506.pdf
    • https://cdn.shopify.com/s/files/1/0435/2986/3323/files/ruposubagolaxepevemed.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45598155969.pdf
    • https://cdn.shopify.com/s/files/1/0432/5382/5704/files/sudodawikomoxeronin.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_off0000a091.bin
426e31af9735c7448620a7dc9777489293a7bcba93361ae0984a01a8f36fbe78		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA091 5744 bytes
font_01_sfnt_off0000b41a.bin
18cd18ff34f30ad54713ac67c4934a52e9429bd75e3aea954af0cf576e643f85		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB41A 9924 bytes

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