Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff796e78ff4e6d9…

MALICIOUS

PDF

40.8 KB Created: 2020-08-18 17:30:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8cf857305f75564093c0e5edd6b3b35 SHA-1: 2c9e1bdb488237fc1fb74c6b9f5227c3e2fdf02d SHA-256: 8ff796e78ff4e6d907b4260bea192f76d4b11431796f68fa88ebc639359bfeb9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links designed to redirect users to malicious infrastructure, specifically targeting 'Yahoo mail settings for Android'. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the presence of a link to known malicious redirector infrastructure. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, many of which are hosted on Shopify, likely to obscure the malicious intent. No scripts were extracted from this sample, but the document body and heuristics strongly suggest a phishing 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.com/pify?keyword=yahoo+mail+settings+for+android
    • http://files.unicorngrief.com/uploads/1/3/1/3/131383953/116342.pdf
    • https://cdn.shopify.com/s/files/1/0429/2139/4343/files/long_division_of_polynomials_practice_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/68407345765.pdf
    • https://cdn.shopify.com/s/files/1/0428/4553/6419/files/dobewesazinamafeboberexo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3006/8898/files/8200188790.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ropuxikasafomudixaxo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6057/5894/files/rolilo.pdf
    • https://cdn.shopify.com/s/files/1/0440/7230/4805/files/75501674375.pdf
    • https://cdn.shopify.com/s/files/1/0431/5247/4267/files/simple_conical_projection_with_one_standard_parallel.pdf
    • https://cdn.shopify.com/s/files/1/0429/0989/2767/files/ramomorewemejel.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_off00006308.bin
82cdb18e9101e934ab99df9b6cf03963f0b81d083f888bee4e71c1c284850fed
pdf-font-stream PDF embedded font (sfnt) at offset 0x6308 5280 bytes
font_01_sfnt_off000074d8.bin
66ccbed04945fd3a262607157698f5a85e446f28890e823d79c2a994b163f34d
pdf-font-stream PDF embedded font (sfnt) at offset 0x74D8 9868 bytes