Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e594f8dabc85e3…

MALICIOUS

PDF

58.9 KB Created: 2020-08-19 16:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14cda3763166f58be6620f1cdea8fc5d SHA-1: a4fbb6dfa052c498f909aec9314d20b6dea863cf SHA-256: 71e594f8dabc85e3a3b7f41f3c30bfd11627a755de3346091534456ea6ac493b
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 pointing to shopify.com URLs that host other PDFs, forming a link farm. One prominent link directs to `https://ttraff.ru/pify?keyword=bing+or+google+yahoo+answers`, which is flagged as malicious redirector infrastructure. This suggests the document is designed to drive traffic to malicious sites, likely for SEO poisoning or to host further malicious content.

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=bing+or+google+yahoo+answers
    • http://files.wildandwoolyworld.com/uploads/1/3/2/6/132682663/5e73712d2095.pdf
    • http://baxadaleg.lynnejonesart.com/uploads/1/3/0/7/130738591/lukiferixa.pdf
    • http://xaredilu.wellbeingsophrology.com/uploads/1/3/0/8/130874474/newewotamazedobagi.pdf
    • http://files.crjartwork.com/uploads/1/3/0/8/130813108/efeb0c3d25333.pdf
    • http://gaxag.nycmoneymavens.com/uploads/1/3/0/7/130775085/557267b99bd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/6734/9923/files/weight_lifting_plans.pdf
    • https://cdn.shopify.com/s/files/1/0430/7435/5351/files/miwabixipitajakama.pdf
    • https://cdn.shopify.com/s/files/1/0436/2698/7680/files/wuguxebowopizaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/4107/1016/files/electronics_projects_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2836/files/49052477482.pdf
    • https://cdn.shopify.com/s/files/1/0449/9632/9636/files/batis_ng_impormasyon.pdf
    • https://cdn.shopify.com/s/files/1/0435/5201/4491/files/shifrin_multivariable_mathematics.pdf
    • https://cdn.shopify.com/s/files/1/0428/5127/0815/files/nerusomagerifulilazirogut.pdf
    • https://cdn.shopify.com/s/files/1/0438/3621/1362/files/biocalculus_calculus_for_the_life_sciences.pdf
    • https://cdn.shopify.com/s/files/1/0440/5392/1957/files/9720063075.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_off0000a956.bin
6acc8701f586d3b5a37bfceebbbc0f9041d82eea1388f8110251805be699a270		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA956 5192 bytes
font_01_sfnt_off0000bb06.bin
31c18e1c9170e63cef390bbaea0f68539de7f5ecada3ebf611305d9d2deae0af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB06 10540 bytes

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