Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a34ea6891de4886…

MALICIOUS

PDF

40.3 KB Created: 2020-09-05 22:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43f9f900d0b83c145f292aa716490163 SHA-1: fd6aff7790010dcc7133152673c1f2cd5d0307a8 SHA-256: 4a34ea6891de48869ea77a4a24993509a4e133b11163506a03a545d08947df6f
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.me/pify?keyword=algebra+1+practice+eoc+answers', is likely intended to lead the user to a malicious site. The file also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDFs, suggesting a tactic to manipulate search engine results or distribute content. No scripts were extracted from this sample.

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.me/pify?keyword=algebra+1+practice+eoc+answers
    • https://cdn.shopify.com/s/files/1/0431/6263/2360/files/wajemoxib.pdf
    • https://cdn.shopify.com/s/files/1/0437/9102/4277/files/calvin_klein_size_guide_boxers.pdf
    • https://cdn.shopify.com/s/files/1/0436/9888/0680/files/lilaku.pdf
    • https://cdn.shopify.com/s/files/1/0435/9805/3535/files/romijejuxumelunagujika.pdf
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/jetanuk.pdf
    • https://static.usrfiles.com/ugd/b8c837_43deaa3efff0478aaac26c00240fc6a9.pdf
    • https://static.usrfiles.com/ugd/b8c837_bc439d48479d4db6a26c634dda491d70.pdf
    • https://static.usrfiles.com/ugd/110ef3_0ac79124011249f08581fd23ce9fb6e1.pdf
    • https://cdn.shopify.com/s/files/1/0433/9925/0072/files/bebunuru.pdf
    • https://cdn.shopify.com/s/files/1/0427/4061/3286/files/48403108025.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5080/files/poruxujudowubosa.pdf
    • https://cdn.shopify.com/s/files/1/0431/2596/4957/files/39430386116.pdf
    • https://cdn.shopify.com/s/files/1/0427/8085/2383/files/bujokusajodosewetegufubu.pdf
    • https://cdn.shopify.com/s/files/1/0435/0833/4744/files/test_de_aprendizaje_visual_auditivo_y_kinestesico.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_off00005f2f.bin
8ab3df22d42380147188fa2bc9da4642e561fd80deceb74b72a2b1f2bf557e2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F2F 5376 bytes
font_01_sfnt_off00007199.bin
aaecb3fd6034b41ebdab3be16e3c2cbed59456bb29eacfb59930d7f3bc20b874		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7199 10200 bytes

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