Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13bdc1247bd8168…

MALICIOUS

PDF

52.9 KB Created: 2020-08-15 18:41:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0d6110dc79e18bcdb86b6fd61f010dc SHA-1: e610591ae307eb688ed8591e596bf4c1256024b3 SHA-256: f13bdc1247bd8168d621a91305d7f1590a0c7766def36ed0f1d18b0d0cec6098
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with a critical heuristic firing for PDF_SEO_LINK_FARM. One of these links, https://ttraff.com/wb?keyword=my%20erroneous%20zones%20pdf, is flagged as a malicious redirector. The document body itself is heavily obfuscated but contains references to the redirector URL and other Shopify-hosted PDFs. The primary attack pattern appears to be SEO poisoning or redirection to malicious content.

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=my%20erroneous%20zones%20pdf
    • http://files.redrivernpl.com/uploads/1/3/1/3/131378899/cb1d1d.pdf
    • https://cdn.shopify.com/s/files/1/0431/0132/3421/files/muxugigolilinol.pdf
    • https://cdn.shopify.com/s/files/1/0430/1550/4029/files/nisabadebisebazesefik.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/22271122494.pdf
    • https://cdn.shopify.com/s/files/1/0434/5007/3240/files/ceratocone_tratamento.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/noviwuvado.pdf
    • https://cdn.shopify.com/s/files/1/0433/0012/6880/files/gotimuvogumukegotawepo.pdf
    • https://cdn.shopify.com/s/files/1/0437/3066/5637/files/gokubuzixuwirazomeduxo.pdf
    • https://cdn.shopify.com/s/files/1/0434/9558/8002/files/passive_voice_exercises_basic.pdf
    • https://cdn.shopify.com/s/files/1/0430/0141/3795/files/beauty_and_the_beast_piano_sheet_music_easy.pdf
    • https://cdn.shopify.com/s/files/1/0429/6497/5765/files/lugamowepuzadanetexos.pdf
    • https://cdn.shopify.com/s/files/1/0432/1938/6526/files/speech_writing_format_cbse_class_12.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_off000092e0.bin
1c6cd32e28cb6675cede3f81e099062482f2ab24821c5f4a5732587e3e2cd302		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92E0 4948 bytes
font_01_sfnt_off0000a3dd.bin
78f96f49617bec856accdaf12fdb812dfe8c6361839b1b81a4ac213fa2a335da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3DD 10276 bytes

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