Malicious PDF — malware analysis report

Static analysis result for SHA-256 827d431c4f5ce89e…

MALICIOUS

PDF

44.8 KB Created: 2020-08-07 01:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ebdf3644d7ef423de6d5f03b7ba8f7c SHA-1: ce9ef344688b4aede80372d2e14371f9700ecd1c SHA-256: 827d431c4f5ce89ef985bbbe8f12fc63e482fa66a837c0b0e464ce3db7862a88
120 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which are hosted on Shopify and appear to be SEO-optimized for book-related terms. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is used to obscure the final destination. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The presence of numerous benign-looking Shopify links is likely a tactic to blend in with legitimate content.

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=business+school+book+pdf+in+english
    • http://files.johnblanke.com/uploads/1/3/1/4/131483685/zumapoxita-tofebejodir.pdf
    • http://nekag.marwinvizslas.com/uploads/1/3/1/4/131454012/gekudidimub-jatebukoguv-viviwumevexofe.pdf
    • http://files.virginianutritionists.org/uploads/1/3/0/7/130775021/maxib_kotivotinakiwo_dusovakageg.pdf
    • https://cdn.shopify.com/s/files/1/0428/9229/6359/files/dadotalaxeduwuvekodogi.pdf
    • https://cdn.shopify.com/s/files/1/0430/3477/1610/files/mezajojugenam.pdf
    • https://cdn.shopify.com/s/files/1/0439/8533/8526/files/puxobomizaverol.pdf
    • https://cdn.shopify.com/s/files/1/0428/1712/6563/files/38938273200.pdf
    • https://cdn.shopify.com/s/files/1/0432/5035/2296/files/bocio_difuso_hiperfuncionante.pdf
    • https://cdn.shopify.com/s/files/1/0435/2416/1704/files/improve_speaking_english_fluently.pdf
    • https://cdn.shopify.com/s/files/1/0428/1863/3894/files/12041511523.pdf
    • https://cdn.shopify.com/s/files/1/0435/8170/2303/files/atom_jsx_plugin.pdf
    • https://cdn.shopify.com/s/files/1/0440/8747/6389/files/80618747751.pdf
    • https://cdn.shopify.com/s/files/1/0441/0392/5912/files/mankiw_macroeconomics_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0438/3748/9309/files/28889053103.pdf
    • https://cdn.shopify.com/s/files/1/0438/2192/4514/files/small_business_plan_example.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_off00007186.bin
00e1bc8804d6914864f75081eea200781e4b428fe1c609b16606f99fa8c4f967		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7186 5364 bytes
font_01_sfnt_off000083cb.bin
0a09333fd2ce73891c38d554aa4df54577ef5e1fc578618e9a5110ae931956a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83CB 10060 bytes

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