Malicious PDF — malware analysis report

Static analysis result for SHA-256 b124cfb5f1385c62…

MALICIOUS

PDF

36.4 KB Created: 2020-08-22 01:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2a4dd1f389a35f324cdf36537b9ac56 SHA-1: 413794180631d05a937a231a2498de739003f294 SHA-256: b124cfb5f1385c62c7c899f5cd5ab18a4c9e4edacaaf3e14322af53d2d511c51
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely used to direct users to further malicious content. The document body, though heavily obfuscated, contains references to 'Ayuwoki game free' and the malicious URL, suggesting a lure for users seeking free game downloads. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy to improve search engine visibility for 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.cc/pify?keyword=ayuwoki+game+free
    • http://depapo.jpligallery.com/uploads/1/3/0/8/130814328/wuvabuvux.pdf
    • https://cdn.shopify.com/s/files/1/0429/4744/4903/files/vuvonarudadosig.pdf
    • https://cdn.shopify.com/s/files/1/0434/5197/3789/files/meaning_of_economic_system.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/16949815227.pdf
    • https://cdn.shopify.com/s/files/1/0432/0693/4688/files/difizesigomudorisuzonigeg.pdf
    • https://cdn.shopify.com/s/files/1/0430/0092/2261/files/livodisuzap.pdf
    • https://cdn.shopify.com/s/files/1/0437/8466/7297/files/xaxezomu.pdf
    • https://cdn.shopify.com/s/files/1/0440/7050/2550/files/jodogivetusij.pdf
    • https://cdn.shopify.com/s/files/1/0428/2476/1507/files/les_articles_partitifs_exercices.pdf
    • https://cdn.shopify.com/s/files/1/0432/4658/3970/files/1890400593.pdf
    • https://cdn.shopify.com/s/files/1/0432/4130/8320/files/77758937954.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7325/files/psa_storyboard_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/notadenagefajofakiwu.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_off00005164.bin
4f560d407202ee146fa7a5d5ac1c854fa5d4a4383426416d086a63f24836eeef
pdf-font-stream PDF embedded font (sfnt) at offset 0x5164 5124 bytes
font_01_sfnt_off000062df.bin
543f5829ae3921990b7d758a3e8e9b52292381e065a476a77411b5ac259c5eb5
pdf-font-stream PDF embedded font (sfnt) at offset 0x62DF 10084 bytes