Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c47485abd48911…

MALICIOUS

PDF

40.7 KB Created: 2020-08-04 00:39:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 79891c3cfaaf0579e6705454e2cf8c17 SHA-1: 88bc94347c1f09aaa005bf905e305942e0983a55 SHA-256: 83c47485abd48911b90312c97b77f2d9153990f30f65cdbfdd3a50e55dea7fb8
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 pointing to benign Shopify domains but one critical link to `ttraff.ru`, a known malicious redirector. The document body, though garbled, contains text related to 'exercises pdf with answers' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise malicious links as academic resources. The primary attack pattern involves redirecting users to malicious infrastructure via embedded links.

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.ru/pify?keyword=a+an+the+no+article+exercises+pdf+with+answers
    • http://files.coastvalleyworship.com/uploads/1/3/0/7/130775518/5865774.pdf
    • http://files.ikargb.co.uk/uploads/1/3/1/4/131409170/c416f2d8c877.pdf
    • http://files.elisakohanski.com/uploads/1/3/0/9/130969471/ribawewi-ximepubolikuvez-wurinu-ketidezewapedu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0342/8510/files/wunoxatataninipibusude.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/79086372433.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90841244024.pdf
    • https://cdn.shopify.com/s/files/1/0429/0412/5599/files/83657899145.pdf
    • https://cdn.shopify.com/s/files/1/0433/3695/8104/files/bovudaxuxupiviteb.pdf
    • https://cdn.shopify.com/s/files/1/0440/3727/5813/files/topolijimezemojer.pdf
    • https://cdn.shopify.com/s/files/1/0431/0745/1042/files/1516862165.pdf
    • https://cdn.shopify.com/s/files/1/0437/4321/5767/files/nike_build_smite.pdf
    • https://cdn.shopify.com/s/files/1/0433/1739/5611/files/davumasozimutazop.pdf
    • https://cdn.shopify.com/s/files/1/0437/6359/7466/files/xenulekamerugosurevuluro.pdf
    • https://cdn.shopify.com/s/files/1/0438/0635/9714/files/72987745563.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bewewolifokolugetu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8202/3061/files/jigujasebi.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_off00005c60.bin
08808732ad775ada1f421917e8b01c1c83f7edb08a96900056e74d1e19344fef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C60 5392 bytes
font_01_sfnt_off00006ecb.bin
9e06165ce1bff2330bb7a550e6235b6a136514fd65496551738441e1f0aad244		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ECB 12084 bytes

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