Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b9e780c257f303d…

MALICIOUS

PDF

39.3 KB Created: 2020-08-19 08:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30165b2c4f4307a16f1dda6a9c50cc27 SHA-1: 0a45f07020d63817357193b32627743fca74244a SHA-256: 0b9e780c257f303deb5d11f1caf0ec34b406e9ffced6610e7e168f67c4505920
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL, suggesting an attempt to lure users to potentially harmful content. The ML classifier also strongly indicated maliciousness.

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=cinderella+man+imdb+parents+guide
    • http://files.ahs-bully-blockers.org/uploads/1/3/2/3/132303219/lawaja_tofagaripobov_renadexarif_pebowi.pdf
    • http://files.iambumi.org/uploads/1/3/1/4/131438211/zuvowofo-sunina.pdf
    • http://files.katestewartwrites.com/uploads/1/3/0/9/130969061/0356d59e5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2905/4118/files/image_slider_jquery_free_for_website.pdf
    • https://cdn.shopify.com/s/files/1/0432/0709/8529/files/temadopajimarapanezizi.pdf
    • https://cdn.shopify.com/s/files/1/0440/7230/4790/files/ataxia_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/6673/7311/files/achieve_ielts_2_second_edition.pdf
    • https://cdn.shopify.com/s/files/1/0445/3980/5855/files/zekafijib.pdf
    • https://cdn.shopify.com/s/files/1/0434/0963/7530/files/fileliwaw.pdf
    • https://cdn.shopify.com/s/files/1/0429/9508/9559/files/fibin.pdf
    • https://cdn.shopify.com/s/files/1/0432/2613/6731/files/rajupemef.pdf
    • https://cdn.shopify.com/s/files/1/0434/4155/3575/files/konumizo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9928/3863/files/44172320693.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_off00005bf6.bin
2846dd582779e530f304b8e18e8a7914df19f48a13f3302509e3265268d51765
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BF6 5324 bytes
font_01_sfnt_off00006deb.bin
0ee885e9e8a497a313ca7191ccfce3a912b9cc51a4fbf47d3cda2e139f427047
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DEB 10172 bytes