Malicious PDF — malware analysis report

Static analysis result for SHA-256 055dd79fa669f920…

MALICIOUS

PDF

43.1 KB Created: 2020-08-12 13:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c61ae324ec1d77e16b568a1eb49ee2a8 SHA-1: c10479581273880375e905d28452a2e45e1db428 SHA-256: 055dd79fa669f920ba634b3f73c62da5194d0dc244205b6c7c0a19caf8ea6fb9
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to benign Shopify URLs, but one critical link redirects to known malicious infrastructure. The document body, though heavily obfuscated, contains the malicious redirector URL and appears to be a lure for downloading PDF files. The ML classifier strongly indicates maliciousness, supporting the conclusion that this is a link-farming or redirection attack.

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.cc/pify?keyword=capit%25C3%25A3es+de+areia+livro+pdf+download
    • http://files.alcuin.org/uploads/1/3/2/6/132681812/493fb0e6e0100ea.pdf
    • http://xemumi.predictionservice.com/uploads/1/3/0/7/130739935/tofapeliles_totimafuzapokax_vapexonebunogoz.pdf
    • http://peleza.allisontaylorphotography.com/uploads/1/3/1/0/131069839/tavam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/1320/0282/files/naxiparowowaz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/denikiv.pdf
    • https://cdn.shopify.com/s/files/1/0435/7862/2111/files/electrical_engineering_exam_papers.pdf
    • https://cdn.shopify.com/s/files/1/0432/1270/1854/files/wordly_wise_3000_book_7_lesson_4.pdf
    • https://cdn.shopify.com/s/files/1/0432/3282/1412/files/breathing_techniques_for_meditation.pdf
    • https://cdn.shopify.com/s/files/1/0435/5119/5299/files/47469574159.pdf
    • https://cdn.shopify.com/s/files/1/0434/3093/6733/files/gabapokenugi.pdf
    • https://cdn.shopify.com/s/files/1/0439/0898/9096/files/84388137383.pdf
    • https://cdn.shopify.com/s/files/1/0434/1553/5774/files/suxafakabovope.pdf
    • https://cdn.shopify.com/s/files/1/0436/0188/7396/files/kenikosamu.pdf
    • https://cdn.shopify.com/s/files/1/0437/4927/7845/files/debaderukonanuralovej.pdf
    • https://cdn.shopify.com/s/files/1/0435/0928/5024/files/otd_to.pdf
    • https://cdn.shopify.com/s/files/1/0440/2970/6390/files/juzoguzulawasuzokuxaj.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_off00006475.bin
ba30fa56aeb1dab9f90c3d4918ad1200d9d1a449278e9afc0e8f7018f92517c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6475 5408 bytes
font_01_sfnt_off00007667.bin
ce1903acbc1450bf3b78296f63de5f38dc0a86ecc04291de4d6370c4ae2c0519		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7667 13008 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.