Malicious PDF — malware analysis report

Static analysis result for SHA-256 2638e816235f8026…

MALICIOUS

PDF

51.6 KB Created: 2020-08-29 20:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 82897d90d979e1ea9039afbd3970a7e8 SHA-1: 741763e7b781d76c93b31cddb5eea5e6ee6eea5d SHA-256: 2638e816235f8026cfb8e1f2f42f00e6012c48a03d74df49d767312e99ff2ad0
120 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to its inclusion of a link farm, which is a common technique for SEO poisoning and redirecting users to malicious sites. The primary malicious URL identified is 'https://ttraff.com/wix?keyword=the+westing+games+questions+and+answ'. While many other URLs were extracted, they appear to be benign links to PDF files hosted on Shopify and usrfiles.com, likely used to lend legitimacy to the link farm. 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.com/wix?keyword=the+westing+games+questions+and+answ
    • https://static.usrfiles.com/ugd/19103d_c66b42c781a54948a5a1c91023399e1b.pdf
    • https://static.usrfiles.com/ugd/b8c837_c8720849d8cc43cc9628223bf32455db.pdf
    • https://static.usrfiles.com/ugd/b8c837_e7db4e5df721457397b4970c38ae0436.pdf
    • https://cdn.shopify.com/s/files/1/0433/9692/3543/files/list_of_engineering_colleges_in_navi_mumbai.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/52733892229.pdf
    • https://cdn.shopify.com/s/files/1/0430/3906/4225/files/24817236247.pdf
    • https://cdn.shopify.com/s/files/1/0429/0733/6857/files/93529384893.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/demotufilonameviv.pdf
    • https://static.usrfiles.com/ugd/b8c837_af90e20f444e4385837840cf9242fc11.pdf
    • https://static.usrfiles.com/ugd/b8c837_3dac6d33d23745beac1c2bc26ccdf979.pdf
    • https://static.usrfiles.com/ugd/b8c837_1dfe8f8888b8491f80ea938412e789d6.pdf
    • https://static.usrfiles.com/ugd/b8c837_f5f882c6613d40fea5d074ba869034d0.pdf
    • https://cdn.shopify.com/s/files/1/0431/5290/0250/files/89930696228.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/print_artist_platinum.pdf
    • https://cdn.shopify.com/s/files/1/0431/0823/7473/files/40363683587.pdf
    • https://cdn.shopify.com/s/files/1/0428/1725/7628/files/body_parts_of_animals_worksheets_for_grade_3.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_off000087ef.bin
49146739aaa0999364603dbedf0131a67cf2fc481c1ea5e30d415c36edab4f00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87EF 5280 bytes
font_01_sfnt_off000099c0.bin
6bd13fa7cadfe32b6de159f9016ddd1b2f3ddd15aecae560c3af8fea8fb33793		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99C0 12156 bytes

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