Malicious PDF — malware analysis report

Static analysis result for SHA-256 691f473ef6d12f50…

MALICIOUS

PDF

77.4 KB Created: 2020-08-14 20:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 63059ac1b42954503135b6d8fbd5eca1 SHA-1: e1ac4558d25d10e58c8b13c32bded6f471737210 SHA-256: 691f473ef6d12f509bbdd66c68f91b1918bf0c7c61bb1a64cac8201baef04278
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded links, many of which point to external resources, suggesting a link farm or redirection strategy. The primary malicious link, 'https://ttraff.ru/pify?keyword=chiranjeevi+songs++in+telugu', is identified as a known malicious redirector. The document body, though heavily obfuscated, contains text related to song lyrics and the authoring application, likely serving as a lure to encourage clicks on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=chiranjeevi+songs++in+telugu
    • http://gugosuku.garageworksphotography.com/uploads/1/3/1/6/131606183/vumovowopaxusilixeje.pdf
    • http://files.creditriskanalytics.net/uploads/1/3/1/4/131437123/tilomarogosuredasun.pdf
    • http://suzezewos.itqansports.com/uploads/1/3/2/7/132740405/fumavajefuvelaw.pdf
    • http://files.realinboundconsulting.com/uploads/1/3/1/1/131163859/66509.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/0278/0057/files/python_gaussian_function.pdf
    • https://cdn.shopify.com/s/files/1/0431/5955/2166/files/bokawubakosewoxarupun.pdf
    • https://cdn.shopify.com/s/files/1/0433/4200/4375/files/86849850045.pdf
    • https://cdn.shopify.com/s/files/1/0429/1425/0905/files/basic_civil_engineering_questions_for_interview.pdf
    • https://cdn.shopify.com/s/files/1/0439/1639/4648/files/44722942674.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20745245188.pdf
    • https://cdn.shopify.com/s/files/1/0431/5525/9560/files/mimifef.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32867625585.pdf
    • https://cdn.shopify.com/s/files/1/0432/8154/7428/files/roxopi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/17418425376.pdf
    • https://cdn.shopify.com/s/files/1/0435/8032/6051/files/ziwewozefetebumizor.pdf
    • https://cdn.shopify.com/s/files/1/0428/2492/5340/files/lerif.pdf
    • https://cdn.shopify.com/s/files/1/0438/6743/9264/files/49275241432.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4c0.bin
8405cc42c8891c63cd70ec7ff38dfbc9cb7c1448eccb9f9daf2e223c30e8a090		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C0 4988 bytes
font_01_sfnt_off0000f5bc.bin
d39b60a5297a0f682c33cc6b0c16e8c5b18d6afb94c7d538e3294836ced2b344		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BC 15960 bytes

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