Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8da438cef66521f…

MALICIOUS

PDF

48.0 KB Created: 2020-08-22 05:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c471ba67898e4d8feea6f86b774778c1 SHA-1: 8653846c587bfdd0e11d9dbd0325f541fc70bc3d SHA-256: c8da438cef66521f72bf9f571fe001d3d53b06b3f3ebea1a76f751e1f33b7297
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, a technique often used to create link farms for SEO manipulation or to direct users to malicious sites. One of the embedded URLs, 'https://ttraff.com/pify?keyword=dance+academy+tv+series', is identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. 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=dance+academy+tv+series
    • http://files.mccownclass.com/uploads/1/3/2/7/132710748/womadoguzu.pdf
    • http://satagug.ashleyscleaningservice.org/uploads/1/3/1/3/131379394/35ae3384.pdf
    • http://delubuxe.nachomamasbedandsnack.com/uploads/1/3/1/1/131164572/074723cb4a01d.pdf
    • http://files.ankezimmermann.net/uploads/1/3/0/8/130874026/wodulubalovutur.pdf
    • https://cdn.shopify.com/s/files/1/0430/3349/3658/files/5696252468.pdf
    • https://cdn.shopify.com/s/files/1/0436/0713/0270/files/14366247722.pdf
    • https://cdn.shopify.com/s/files/1/0434/7995/7669/files/xisuwup.pdf
    • https://cdn.shopify.com/s/files/1/0437/0235/4070/files/chemistry_notes_for_class_11_chapter_1.pdf
    • https://cdn.shopify.com/s/files/1/0433/0369/8600/files/28944887531.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/59766798631.pdf
    • https://cdn.shopify.com/s/files/1/0434/8962/4224/files/76187894354.pdf
    • https://cdn.shopify.com/s/files/1/0431/2013/2257/files/antegrade_cerebral_perfusion.pdf
    • https://cdn.shopify.com/s/files/1/0432/8760/9497/files/tukefolebaxi.pdf
    • https://cdn.shopify.com/s/files/1/0462/9073/1169/files/lexewisubejumowowogir.pdf
    • https://cdn.shopify.com/s/files/1/0429/2168/9254/files/building_self_esteem_activities.pdf
    • https://cdn.shopify.com/s/files/1/0439/7203/4718/files/82551835924.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_off00007e1d.bin
a4f9f0343c009378f5dda4a1beb89307034586277a42c9d5fc30b102debec80d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E1D 5216 bytes
font_01_sfnt_off00008fcf.bin
9448a38785aec1c6edbbbe4052cc7c11274b562482555e5f9b5d572552a7bff8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FCF 10364 bytes

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