Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eb1878dffdf7a6b…

MALICIOUS

PDF

43.7 KB Created: 2020-08-13 02:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01f998ec457a5fa0c56debe3636708b0 SHA-1: 9f4d10ec7109a272d68f57012f7ca5808ce03b7b SHA-256: 5eb1878dffdf7a6b83f924f71f3fbc5fe5dabb470afb836b572e189e8312bc92
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO poisoning tactic to drive traffic to malicious sites. The document body, though heavily corrupted, contains text related to 'grade 3 fractions worksheets pdf' and the malicious URL, indicating a lure to disguise the malicious intent. No scripts were extracted from this sample.

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.ru/wb?keyword=grade%203%20fractions%20worksheets%20pdf
    • http://files.coffeegraceoils.com/uploads/1/3/1/3/131384229/dodesinakiva.pdf
    • http://zerif.wincantonchiropractic.com/uploads/1/3/1/4/131453540/ritebenoj.pdf
    • http://files.reainfocus.com/uploads/1/3/0/7/130775009/a17163e.pdf
    • http://files.aomskw.com/uploads/1/3/1/3/131382841/lovan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0454/2873/6168/files/23509892321.pdf
    • https://cdn.shopify.com/s/files/1/0431/1256/2849/files/54777700462.pdf
    • https://cdn.shopify.com/s/files/1/0429/1903/5033/files/gujupivolamunejobani.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7100/files/biluleder.pdf
    • https://cdn.shopify.com/s/files/1/0433/9400/7201/files/autosys_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0432/5729/9097/files/28816509981.pdf
    • https://cdn.shopify.com/s/files/1/0428/5608/7708/files/72621669797.pdf
    • https://cdn.shopify.com/s/files/1/0431/4441/3350/files/lovamorelurez.pdf
    • https://cdn.shopify.com/s/files/1/0432/4953/3088/files/vobixowalu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3957/9546/files/radical_planning_theory.pdf
    • https://cdn.shopify.com/s/files/1/0437/5488/1175/files/ceiling_fan_e206035.pdf
    • https://cdn.shopify.com/s/files/1/0451/5568/0410/files/reduce_file_size_mac_without_losing_quality.pdf
    • https://cdn.shopify.com/s/files/1/0435/9480/9512/files/how_to_mod_ps3.pdf
    • https://cdn.shopify.com/s/files/1/0439/1705/0008/files/42831155829.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a3c.bin
b7e81078ca1921b06bc7b57a8682ea0fc8d8ab2df7f8ec833f8df47aae0587ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A3C 3144 bytes
font_01_sfnt_off0000655f.bin
cdbcbc8b7fe636c4357399cb425a3c7870a0677899268e6aec2e394d748c5447		 pdf-font-stream PDF embedded font (sfnt) at offset 0x655F 5560 bytes
font_02_sfnt_off00007860.bin
1114e449067eb48ceb592b667f0ef8be3ed8b55f0be0d6d57fab91e03e7f9df7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7860 12816 bytes

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