Malicious PDF — malware analysis report

Static analysis result for SHA-256 86969df5ff1d91b3…

MALICIOUS

PDF

45.2 KB Created: 2020-08-14 15:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3518c88e3ef15b893c46f46959f86f32 SHA-1: f3ab1526fac2b7f2894973b6e5e4aabd82740ccf SHA-256: 86969df5ff1d91b328a698d39459fa0c6a2ef8a35fdea2e6ef9108d9a7a31e74
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO poisoning attack designed to drive traffic to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted from this sample.

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=color+blue+worksheets+pdf
    • http://femid.actionins.net/uploads/1/3/2/3/132302939/pamudugu.pdf
    • http://files.crafty-counselor.com/uploads/1/3/0/7/130776058/baxivimowibevalu.pdf
    • http://files.bookshelf-bookshelf.com/uploads/1/3/1/3/131381904/kikodezi.pdf
    • http://files.nebulosus-severine.com/uploads/1/3/1/4/131437308/lezutufepowulijuzumu.pdf
    • http://files.whitehorsediocese.ca/uploads/1/3/1/4/131438216/vuxesaramob.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1285/files/99474823277.pdf
    • https://cdn.shopify.com/s/files/1/0434/5197/3794/files/gavuliw.pdf
    • https://cdn.shopify.com/s/files/1/0434/0737/6546/files/pokemon_solar_light_and_lunar_dark_pokedex.pdf
    • https://cdn.shopify.com/s/files/1/0435/1868/9434/files/zuwixizabi.pdf
    • https://cdn.shopify.com/s/files/1/0437/2535/7206/files/bolimokuvukilopo.pdf
    • https://cdn.shopify.com/s/files/1/0437/7346/0641/files/jopodorexu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6240/2967/files/persona_bergman_script.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/sesujalitogakisojeso.pdf
    • https://cdn.shopify.com/s/files/1/0434/7019/2805/files/9943359379.pdf
    • https://cdn.shopify.com/s/files/1/0428/1958/4166/files/jefuzofoxodavositimup.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/soparuvuridove.pdf
    • https://cdn.shopify.com/s/files/1/0445/3846/2372/files/sociological_research_methods.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_off00007393.bin
48d412f03744840f52d803e40240f53f7f1a23256c70c1d0aeee80919ee61499
pdf-font-stream PDF embedded font (sfnt) at offset 0x7393 5120 bytes
font_01_sfnt_off00008502.bin
8db1df7bbe487bb8f2b5e47c4c7555dd7752baaae061e136f6b9d8d4862e993b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8502 10352 bytes