Malicious PDF — malware analysis report

Static analysis result for SHA-256 868b8ad6cc75453c…

MALICIOUS

PDF

42.8 KB Created: 2020-08-13 08:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a38bed705459c78bd22ffd674206985c SHA-1: 88a9d4415456b97d4667210b59dad9aff68f988b SHA-256: 868b8ad6cc75453cda684e6dc080e5ad11e1ffde85a57dd5f8fd913a3786a4ec
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though partially corrupted, includes text related to 'science worksheets for grade 6' and the malicious URL, suggesting a lure to disguise malicious activity. The presence of a link farm further indicates an attempt to distribute 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=science%20worksheets%20for%20grade%206
    • http://files.rangerschoolofdance.com/uploads/1/3/1/3/131397973/supukilusitutu_lorexis_tozatevik.pdf
    • http://kirok.emmaredmarchrose.com/uploads/1/3/1/1/131164250/fdffcdf714.pdf
    • http://files.rowenglenkennels.com/uploads/1/3/0/7/130776131/144923.pdf
    • http://jalun.sakbooks.com/uploads/1/3/2/7/132710507/waduzoj_jugojosas.pdf
    • http://files.mountainhomeyogacenter.com/uploads/1/3/1/0/131071166/zaned-ramanuxater.pdf
    • https://cdn.shopify.com/s/files/1/0440/7335/3366/files/differences_between_american_and_british_english_grammar.pdf
    • https://cdn.shopify.com/s/files/1/0439/3402/3848/files/mathematical_modelling_and_computer_simulation_of_activated_sludge_systems.pdf
    • https://cdn.shopify.com/s/files/1/0430/3234/6773/files/31871454370.pdf
    • https://cdn.shopify.com/s/files/1/0431/9900/4827/files/acer_aspire_one_756_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/3196/9438/files/92923209666.pdf
    • https://cdn.shopify.com/s/files/1/0429/5986/3961/files/tojefafinalegi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4356/1376/files/88833640656.pdf
    • https://cdn.shopify.com/s/files/1/0437/6153/3089/files/75515359999.pdf
    • https://cdn.shopify.com/s/files/1/0433/0386/2440/files/68599023628.pdf
    • https://cdn.shopify.com/s/files/1/0439/2511/0952/files/ataxia_telangiectasia_review.pdf
    • https://cdn.shopify.com/s/files/1/0433/4842/6902/files/molewulenumabofuli.pdf
    • https://cdn.shopify.com/s/files/1/0431/7465/8216/files/zewoxevenejobikipu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7949/9940/files/luwaduruxuzumakosewimev.pdf
    • https://cdn.shopify.com/s/files/1/0429/4085/8527/files/7913553465.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_off000067d0.bin
7a7420a1e66edf65f07b6df1a48ec4739c067d41c6119fb2f2bc0c0a92685c7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x67D0 5664 bytes
font_01_sfnt_off00007b19.bin
340f06d2d80224726c7531d2c63ba101a0fca7e30bc9e2977edc87947768d36c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B19 10180 bytes