Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fbabd85b3dacc48…

MALICIOUS

PDF

37.3 KB Created: 2020-08-19 01:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 092e43195b71cb1f0f6c49f1bd74e642 SHA-1: 9a75b53e344155fae9eb884f527b73ad4574a68d SHA-256: 0fbabd85b3dacc489eab5bcd1c0ee3b0681cbbe76c0bcfce8241cd12b93c3f9b
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 external PDF files hosted on Shopify. One of these links, 'https://ttraff.com/pify?keyword=slant+asymptote+pdf', is identified as a malicious redirector. The document body and embedded artifacts suggest the PDF is designed to host and distribute these links, likely as part of a link farm or SEO manipulation scheme to drive traffic to malicious infrastructure.

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.com/pify?keyword=slant+asymptote+pdf
    • http://gituvojop.kidsalldressedup.org/uploads/1/3/1/4/131452903/xokabitovaxa.pdf
    • http://wozudato.alabamaassure.com/uploads/1/3/0/7/130738902/9585339.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/6394/8950/files/65058105656.pdf
    • https://cdn.shopify.com/s/files/1/0438/3490/0642/files/html5_bangla_book_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/3092/1895/files/briggs_and_stratton_engine_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/2925/6613/files/fipixiketivolij.pdf
    • https://cdn.shopify.com/s/files/1/0437/2827/3569/files/35303985963.pdf
    • https://cdn.shopify.com/s/files/1/0429/9541/7237/files/79446576464.pdf
    • https://cdn.shopify.com/s/files/1/0436/9671/7992/files/early_childhood_education_in_canada.pdf
    • https://cdn.shopify.com/s/files/1/0431/1390/6333/files/mobogenie_for_android_6._0_1_free.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_off00005589.bin
d140a8b9d800b5ad52836b82ecc1f0b0bed7d479776180be5fcf2265e21e6373
pdf-font-stream PDF embedded font (sfnt) at offset 0x5589 5296 bytes
font_01_sfnt_off00006781.bin
5aeaffcde38a3b5953fbb4cc0fcfbef4c205f4a433d516a9e7c4889b8a0ab51b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6781 9844 bytes