Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a9eff0e9b356654…

MALICIOUS

PDF

39.9 KB Created: 2020-08-15 18:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 763ff5b5253eb710881b0386243d58c5 SHA-1: 16100476361bae38d9d77b6272374baabe5e30d5 SHA-256: 1a9eff0e9b356654b02714949c5a90d28308766a80a6f2c6f4ffb2785a6bb3ee
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link redirects to a known malicious domain (ttraff.cc). This suggests a link farm used to obscure malicious redirects. The document body, though heavily obfuscated, contains the same malicious URL, indicating an attempt to lure users to a potentially harmful site under the guise of an educational worksheet.

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=author%2527+s+tone+worksheet+4th+grade
    • http://files.mrswashburnsclass.com/uploads/1/3/1/6/131607467/lawugak.pdf
    • http://files.southernstyledevents.com/uploads/1/3/1/4/131452740/zibek.pdf
    • http://files.annairisgraham.com/uploads/1/3/2/7/132740186/kutiz.pdf
    • http://files.oakcreekcenter.org/uploads/1/3/0/9/130969686/284eb8c7bba5383.pdf
    • https://cdn.shopify.com/s/files/1/0427/7331/5740/files/crown_came_off.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bokowolexom.pdf
    • https://cdn.shopify.com/s/files/1/0439/2294/8251/files/wubotulinafarekilexepofo.pdf
    • https://cdn.shopify.com/s/files/1/0437/6081/2189/files/60197472781.pdf
    • https://cdn.shopify.com/s/files/1/0430/5344/9365/files/81718431916.pdf
    • https://cdn.shopify.com/s/files/1/0433/8181/7495/files/jetaputodamulemapukunoba.pdf
    • https://cdn.shopify.com/s/files/1/0428/7542/0835/files/varuwupozarur.pdf
    • https://cdn.shopify.com/s/files/1/0432/0795/0495/files/robofupixopevewonik.pdf
    • https://cdn.shopify.com/s/files/1/0435/7370/6913/files/logutarosuserufedepo.pdf
    • https://cdn.shopify.com/s/files/1/0429/3446/8774/files/20382659443.pdf
    • https://cdn.shopify.com/s/files/1/0434/6124/7129/files/the_snows_of_kilimanjaro.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_off0000602d.bin
79c474bdb5f97c7342ebd08fad3342ddfc18d486ec8c268284a2fbcea314cd46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x602D 5324 bytes
font_01_sfnt_off00007261.bin
d2ab6ea1f380ffda177ad2e95a9812f2279988d552f241c507b0143213caf374		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7261 9524 bytes

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