Malicious PDF — malware analysis report

Static analysis result for SHA-256 a436b7a1deb4f6bf…

MALICIOUS

PDF

42.0 KB Created: 2020-08-14 04:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30f62f83adef929da8b884fdfd3e4f1e SHA-1: 3d256198263f64d1ead337de980f68b8d0462f48 SHA-256: a436b7a1deb4f6bf5c032ca3433f8a0216981a2e6054c51463030e1c9007ccc4
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.com'. The document body, though partially corrupted, includes this URL and a reference to sorting Excel spreadsheets, likely a lure. The PDF also hosts a large number of external links, many pointing to Shopify, which is flagged as a PDF link farm. The ML classifier strongly indicates 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=sort+excel+spreadsheet+by+2+columns
    • http://files.ahimsaveganliving.com/uploads/1/3/0/7/130739287/neraga-poxatizidit.pdf
    • http://files.philhamiltondesign.com/uploads/1/3/1/4/131483002/beraf_noxepi.pdf
    • http://files.addingtonforge.com/uploads/1/3/0/7/130775537/4672366.pdf
    • http://files.fourscompanymusic.com/uploads/1/3/1/8/131856498/d3e53.pdf
    • https://cdn.shopify.com/s/files/1/0429/3197/8403/files/shear_force_and_bending_moment_calculations.pdf
    • https://cdn.shopify.com/s/files/1/0437/3407/3505/files/3340646367.pdf
    • https://cdn.shopify.com/s/files/1/0432/9209/8726/files/diccionario_enciclopedico_de_derecho_usual_cabanellas.pdf
    • https://cdn.shopify.com/s/files/1/0428/3367/4396/files/41278596311.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/30553092986.pdf
    • https://cdn.shopify.com/s/files/1/0430/6901/4177/files/49705103765.pdf
    • https://cdn.shopify.com/s/files/1/0438/6252/4069/files/basel_111.pdf
    • https://cdn.shopify.com/s/files/1/0432/8210/4478/files/33505826938.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6360/files/95472535709.pdf
    • https://cdn.shopify.com/s/files/1/0430/6350/9143/files/navapowa.pdf
    • https://cdn.shopify.com/s/files/1/0438/4771/2928/files/android_10_xiaomi_redmi_note_8_pro.pdf
    • https://cdn.shopify.com/s/files/1/0428/3950/7100/files/68779481942.pdf
    • https://cdn.shopify.com/s/files/1/0430/3385/4101/files/computer_concepts_2016_comprehensive.pdf
    • https://cdn.shopify.com/s/files/1/0432/5218/7298/files/pdf_biocalculus_calculus_probability_and_statistics_for_the_life_sciences.pdf
    • https://cdn.shopify.com/s/files/1/0431/7813/1611/files/tuzubagu.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_off000064f6.bin
38d912f9205acfc78567fce24537645cc9745a718dee2b0a411b91d0aec19762		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64F6 5856 bytes
font_01_sfnt_off000078bc.bin
e1975d5ad1cdfae12e2a2c77b8efed957cf72a549b68aba7e014f59882e291b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78BC 9996 bytes

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