Malicious PDF — malware analysis report

Static analysis result for SHA-256 e523b74bafbc2d6e…

MALICIOUS

PDF

40.6 KB Created: 2020-08-23 08:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e2523d1ad58437fa44a82cce23da5a6 SHA-1: ac5e68eef6a5982797955a417647306ec630f69e SHA-256: e523b74bafbc2d6e9ecba0f538c316c31f5019f92b84c569e6ca416eebedffba
120 Risk Score

Malware Insights

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

The PDF file contains a mass of external links, many of which point to a redirector service. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=linear+function+worksheet', suggesting a lure to a malicious site. The presence of numerous links to Shopify domains, some flagged as benign and others unknown, indicates a link farm strategy. The primary malicious link is likely intended to redirect the user to a phishing or malware distribution site.

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.cc/pify?keyword=linear+function+worksheet
    • http://files.zer0excuses.com/uploads/1/3/1/1/131163953/5156008.pdf
    • http://boxavapa.afrikanvoodoopriest.com/uploads/1/3/1/3/131383483/gikabivikavewu.pdf
    • http://files.elizabethrk.com/uploads/1/3/1/4/131438639/gitisul.pdf
    • https://cdn.shopify.com/s/files/1/0437/6539/9713/files/zoxas.pdf
    • https://cdn.shopify.com/s/files/1/0431/6561/4234/files/eiffel_65_blue_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0433/4118/5189/files/87683166107.pdf
    • https://cdn.shopify.com/s/files/1/0434/3971/8562/files/pokemon_black_guides.pdf
    • https://cdn.shopify.com/s/files/1/0438/2071/2098/files/nazot.pdf
    • https://cdn.shopify.com/s/files/1/0431/3110/9540/files/icao_annex_14_volume_2_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0437/2027/8171/files/76390705664.pdf
    • https://cdn.shopify.com/s/files/1/0430/2874/2298/files/effective_academic_writing_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0437/2935/4903/files/25257694578.pdf
    • https://cdn.shopify.com/s/files/1/0434/1553/5774/files/56071180859.pdf
    • https://cdn.shopify.com/s/files/1/0437/0749/8647/files/calcium_chloride_msds_sigma.pdf
    • https://cdn.shopify.com/s/files/1/0434/6707/9830/files/1019010121.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_off0000608e.bin
2d5e5a97a2c12f831badfc62b9bfea48a18930b1402ce2707e9127dd9860ad8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x608E 5036 bytes
font_01_sfnt_off000071c0.bin
45e2a4ac7fe9a7184037d237ec389cd5b107c8d608fe30e96566f2a4da96d746		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71C0 10852 bytes

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