Malicious PDF — malware analysis report

Static analysis result for SHA-256 f435e23f37315326…

MALICIOUS

PDF

47.0 KB Created: 2020-08-06 05:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b32e2da930e58244c10d958f84714ab SHA-1: 592bfaa59c10cd4688b93456ff8cca09b947bf8b SHA-256: f435e23f3731532623a987c1c16b583805dacf54b623ef7e55ef72b2e0eb17a5
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains, but one critical link redirects to 'ttraff.com', which is flagged as a malicious redirector. The document body, though partially corrupted, contains text related to 'Estrategias especificas de aprendizaje cooperativo pdf' and the malicious URL, suggesting a lure to download further content or engage in a scam. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wb?keyword=estrategias%20especificas%20de%20aprendizaje%20cooperativo%20pdf
    • http://files.charlottehager.com/uploads/1/3/1/4/131453432/9cd2b68b7a2e6cb.pdf
    • http://files.willamettecounselingservices.com/uploads/1/3/0/7/130775974/gixafix.pdf
    • http://files.katrinahollowayphotography.co.uk/uploads/1/3/1/3/131398184/024673.pdf
    • http://files.easttexastshirts.com/uploads/1/3/1/0/131071253/5765665.pdf
    • https://cdn.shopify.com/s/files/1/0430/0357/6481/files/sadafafab.pdf
    • https://cdn.shopify.com/s/files/1/0434/6635/8934/files/financial_accounting_theory_notes.pdf
    • https://cdn.shopify.com/s/files/1/0429/9731/7783/files/segegajejexuxuf.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/verukapujamivegumu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2178/6521/files/kobumixulezapa.pdf
    • https://cdn.shopify.com/s/files/1/0433/1683/8558/files/28357343866.pdf
    • https://cdn.shopify.com/s/files/1/0429/0985/9999/files/12283831816.pdf
    • https://cdn.shopify.com/s/files/1/0431/4991/8362/files/wurexakiwafodepul.pdf
    • https://cdn.shopify.com/s/files/1/0431/8520/9506/files/mods_para_minecraft_pe_0._9._5.pdf
    • https://cdn.shopify.com/s/files/1/0436/2688/9374/files/kewosuwakagimowolakita.pdf
    • https://cdn.shopify.com/s/files/1/0446/2955/7411/files/global_asset_allocation_with_equities_bonds_and_currencies.pdf
    • https://cdn.shopify.com/s/files/1/0430/0016/8597/files/xejubejizagire.pdf
    • https://cdn.shopify.com/s/files/1/0437/6661/2130/files/sobizijir.pdf
    • https://cdn.shopify.com/s/files/1/0432/2299/1007/files/ruwajabufudaxonel.pdf
    • https://cdn.shopify.com/s/files/1/0429/5265/5002/files/tiwefebati.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_off000076ee.bin
ee841bbaa6c7b17cd11c58be6e71886f743d115d50e1990cfee659a462827363
pdf-font-stream PDF embedded font (sfnt) at offset 0x76EE 5432 bytes
font_01_sfnt_off00008996.bin
77d900df52c0f16929b7367692871e336e2173b762fb18256dded57155b55e6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8996 11236 bytes