Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0806236f8bd3346…

MALICIOUS

PDF

38.4 KB Created: 2020-08-05 23:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 000ec950ba09157006e35818e1b14f42 SHA-1: f516430a55478591635f0a1c7da793f196ab13ae SHA-256: b0806236f8bd3346578d297dd84539a6d0ef1b4a36f5425a7f5305f19809e970
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=jpg+to+pdf+small+file+size', which is also listed as a malicious redirector. The presence of numerous links to Shopify-hosted PDFs suggests an attempt to create a link farm for SEO poisoning or to obscure the malicious redirector. 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.ru/pify?keyword=jpg+to+pdf+small+file+size
    • http://files.phoenjitsu.com/uploads/1/3/1/8/131856476/6626848.pdf
    • http://files.mello-works.com/uploads/1/3/0/7/130739826/4469358.pdf
    • http://files.houndheritage.org/uploads/1/3/1/1/131163684/falunudugipa_badusin_nenepine.pdf
    • https://cdn.shopify.com/s/files/1/0437/2388/2650/files/45319138044.pdf
    • https://cdn.shopify.com/s/files/1/0433/0035/6251/files/99500020991.pdf
    • https://cdn.shopify.com/s/files/1/0435/7410/0127/files/75814501171.pdf
    • https://cdn.shopify.com/s/files/1/0431/7003/7917/files/96658060028.pdf
    • https://cdn.shopify.com/s/files/1/0437/9430/1085/files/fiporobuguzetopenuxij.pdf
    • https://cdn.shopify.com/s/files/1/0429/3876/1379/files/podawekusejobebenuregadu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8034/3967/files/funatamofe.pdf
    • https://cdn.shopify.com/s/files/1/0432/6853/8521/files/vakebog.pdf
    • https://cdn.shopify.com/s/files/1/0437/2021/2645/files/96524925935.pdf
    • https://cdn.shopify.com/s/files/1/0427/4946/0636/files/28398406560.pdf
    • https://cdn.shopify.com/s/files/1/0433/9977/4364/files/acing_evidence.pdf
    • https://cdn.shopify.com/s/files/1/0433/4862/3510/files/sesirijewi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7701/files/91741137723.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_off00005922.bin
d3dce7d7112cd52d029281e91ea69f001fd700426da2f27c7ed3b9793c17daa0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5922 5304 bytes
font_01_sfnt_off00006b28.bin
1e8af8ad1b32a26ee46fac86aa0c7d54da3adb96c3e158926b782d5300fafa70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B28 9860 bytes

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