Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f5e555fae2b7198…

MALICIOUS

PDF

45.5 KB Created: 2020-08-10 01:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 685fcc46674c157eae8f6f399f4841cd SHA-1: c28fbbdb687f5ad0881e4d84613778de97b1e0e9 SHA-256: 0f5e555fae2b7198bdbd4815e67e6c3e094787ca029ad3b2acd55429385c4a6f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One prominent link, however, directs to 'ttraff.ru', identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'multiplying fractions worksheets grade 5 pdf' and the malicious URL, indicating a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious.

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/pify?keyword=multiplying+fractions+worksheets+grade+5+pdf
    • http://tegux.1stjacan.com/uploads/1/3/0/7/130775732/perar.pdf
    • http://mowitirav.mikesfamoussteaksandsubs.com/uploads/1/3/0/8/130814297/fopegojuga_jewepimol_pesepen_xurone.pdf
    • http://files.sassysewingandembroidery.com/uploads/1/3/1/3/131384113/5667161.pdf
    • http://files.jacejavucce.com/uploads/1/3/2/6/132682822/mapoga.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3092/0871/files/93560258888.pdf
    • https://cdn.shopify.com/s/files/1/0433/1637/9816/files/tigelix.pdf
    • https://cdn.shopify.com/s/files/1/0435/9336/7710/files/39167843393.pdf
    • https://cdn.shopify.com/s/files/1/0432/2636/6111/files/vudub.pdf
    • https://cdn.shopify.com/s/files/1/0431/4411/8428/files/supply_chain_risk_management_thesis.pdf
    • https://cdn.shopify.com/s/files/1/0429/4115/3439/files/20760902083.pdf
    • https://cdn.shopify.com/s/files/1/0436/0034/7299/files/azar_grammar_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/7839/3762/files/xolekovawuk.pdf
    • https://cdn.shopify.com/s/files/1/0432/0077/4307/files/guxel.pdf
    • https://cdn.shopify.com/s/files/1/0432/3305/0779/files/read_in_r.pdf
    • https://cdn.shopify.com/s/files/1/0431/9910/3136/files/56211773741.pdf
    • https://cdn.shopify.com/s/files/1/0439/2887/9272/files/67853163038.pdf
    • https://cdn.shopify.com/s/files/1/0440/9825/7048/files/business_email_writing_for_dummies.pdf
    • https://cdn.shopify.com/s/files/1/0432/7663/2214/files/chuck_palahniuk_collection.pdf
    • https://cdn.shopify.com/s/files/1/0437/6192/6293/files/sedozenalebenabu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007271.bin
cd6c1e13165c4e13999accdcfed378c50af3d0e8aa6e5b8afb05cf8d8f9618cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7271 5804 bytes
font_01_sfnt_off00008657.bin
de450acd380e2416ea9d838d9668d67129d8273771b239e825eca010844cda22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8657 9952 bytes

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