Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf64ad10f143dc45…

MALICIOUS

PDF

43.0 KB Created: 2020-08-01 05:40:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a396ba24fded5f5d8cf0af4deba93970 SHA-1: 7cf5160d21b77c60659d88fd021acc162fe32018 SHA-256: bf64ad10f143dc455ca75b9678a5ac242255fabad5d6f19d211f09a019367bd5
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are part of a link farm, suggesting an attempt to manipulate search engine results or distribute malicious content through a large number of seemingly benign PDF files. The primary malicious URL identified is https://ttraff.ru/pify?keyword=bow+of+eternal+frost.

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.ru/pify?keyword=bow+of+eternal+frost
    • http://files.stedmundsbaby.org.uk/uploads/1/3/2/7/132712315/d16d2.pdf
    • http://files.billchosycamore.com/uploads/1/3/2/6/132681694/jilak.pdf
    • http://files.naturallynickelfree.com/uploads/1/3/2/7/132710624/nasejurolasid.pdf
    • http://files.aworldofwishes.com/uploads/1/3/0/8/130813855/sajez.pdf
    • https://cdn.shopify.com/s/files/1/0438/0485/2386/files/linux_rename_directory.pdf
    • https://cdn.shopify.com/s/files/1/0434/0023/3112/files/53606897772.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89377355024.pdf
    • https://cdn.shopify.com/s/files/1/0436/5120/3225/files/52053600830.pdf
    • https://cdn.shopify.com/s/files/1/0433/4374/1083/files/76133486510.pdf
    • https://cdn.shopify.com/s/files/1/0437/2755/2661/files/tovuxepikorunif.pdf
    • https://cdn.shopify.com/s/files/1/0431/8602/8708/files/latex_highlight_text.pdf
    • https://cdn.shopify.com/s/files/1/0430/5109/0077/files/guvub.pdf
    • https://cdn.shopify.com/s/files/1/0437/2866/6785/files/silusozumujenonibaxuve.pdf
    • https://cdn.shopify.com/s/files/1/0433/0012/6885/files/83593274976.pdf
    • https://cdn.shopify.com/s/files/1/0432/5376/0162/files/guwazijukogoregar.pdf
    • https://cdn.shopify.com/s/files/1/0438/4532/0861/files/70242963154.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_off00006ab9.bin
6d85b7d268c73efb39ed13075fb8e97c2abeab7b1ba20bf40569c4b2c3162feb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB9 4904 bytes
font_01_sfnt_off00007b89.bin
7d7e6382c67ff3402ebcb0ac70f0b7648777a027c17dae553563b76cc6c2b358		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B89 10352 bytes

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