Malicious PDF — malware analysis report

Static analysis result for SHA-256 527ec4e9e5cbec45…

MALICIOUS

PDF

45.5 KB Created: 2020-08-31 04:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e3418da1896c90aaa2e097be0ea56a3 SHA-1: 4cac94ff6713014b7a798e961c11838c7c039cb1 SHA-256: 527ec4e9e5cbec45f91d7d72f42f4ceaccb8d11778af00739305a3eda9b50568
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF file contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'mean median mode range worksheets pdf' and the malicious URL. This suggests a social engineering attempt to trick users into downloading potentially harmful content by disguising it as educational material. The presence of many links to static.usrfiles.com indicates a link farm used for SEO poisoning.

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/wix?keyword=mean+median+mode+range+worksheets+pdf
    • https://static.usrfiles.com/ugd/d55797_126699fa52d34d8bb5bbe6179f7ad96f.pdf
    • https://static.usrfiles.com/ugd/b8c837_614345f4df674ab5bdd4266c150813d2.pdf
    • https://static.usrfiles.com/ugd/73f3b0_8e53e3aef71c41a98d36fef9e0ae3043.pdf
    • https://static.usrfiles.com/ugd/cf14a4_1bf5a1201e5445b68f5d0343d0427a1f.pdf
    • https://static.usrfiles.com/ugd/b85eb0_c8b5a1d5365a4bcf958ab6f143202c65.pdf
    • https://cdn.shopify.com/s/files/1/0440/0742/4158/files/32268154111.pdf
    • https://cdn.shopify.com/s/files/1/0430/3713/0914/files/17298143485.pdf
    • https://cdn.shopify.com/s/files/1/0439/4611/5230/files/ribaxokanemomobuluwudu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/pifakasetosejizapini.pdf
    • https://static.usrfiles.com/ugd/3bca44_f8ac41911a3f485a94b4cb384007737a.pdf
    • https://static.usrfiles.com/ugd/cac9e4_399dc26df5da45cbb479544d1117cd24.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e2cf96783db41a9a84eafb9309f6046.pdf
    • https://static.usrfiles.com/ugd/3fc21f_70656bf9843f4fbfa4f9b61cbad2bc16.pdf
    • https://static.usrfiles.com/ugd/b8c837_5174640b49f242659a64cefd91a3e8d8.pdf
    • https://cdn.shopify.com/s/files/1/0433/0458/3318/files/sokawevokiziwe.pdf
    • https://cdn.shopify.com/s/files/1/0437/0815/4008/files/67701483410.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_off00006a7e.bin
5dd5bcad7d660c8740e337f3df78d6640da80c55f6892773d52353976ebb0166		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A7E 5584 bytes
font_01_sfnt_off00007d6f.bin
89489e1cec7a3559b0db7e4f04137663883841c5a81d9d2065a82e4133bf627e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D6F 14164 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.