Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae34b0a782d6123c…

MALICIOUS

PDF

41.9 KB Created: 2020-08-31 13:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 432b6460b0ab1b0be5818d8f0fd633da SHA-1: c310c5f9ee1373fb69de9740eff5ec4838ebe30b SHA-256: ae34b0a782d6123ccbbe94a3eb08356dc54588cd8fc55bbfd05abf52a73e2995
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it points to malicious infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for educational content. This URL, along with other embedded links, suggests a social engineering attack aiming to redirect users to malicious sites. The presence of a link farm heuristic further supports the malicious intent.

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=algebra+1+evaluating+expressions+worksheet+pdf
    • https://static.usrfiles.com/ugd/5b604d_ecfd0bba3b814ea695a685c8269e71ce.pdf
    • https://static.usrfiles.com/ugd/1f5cef_0d41a573eae643c89cde17e7eefdcae4.pdf
    • https://static.usrfiles.com/ugd/b8c837_8f3c9b208a314ac3b35194506fae5083.pdf
    • https://static.usrfiles.com/ugd/afe78f_f4100f3f21b449338b0a5079b8b54c65.pdf
    • https://static.usrfiles.com/ugd/ecec20_bf8307014e7c4f6381ad780bf8755dd1.pdf
    • https://static.usrfiles.com/ugd/73f3b0_ea7cc85e58cb4962bae76a6931b66843.pdf
    • https://static.usrfiles.com/ugd/269bb8_ba2dd016043341a3987dd6c1a2642f0a.pdf
    • https://cdn.shopify.com/s/files/1/0437/1283/9834/files/java_1._8_update_101_32_bit.pdf
    • https://cdn.shopify.com/s/files/1/0430/0311/7721/files/xelijiwinezusij.pdf
    • https://cdn.shopify.com/s/files/1/0431/5529/2321/files/kelusetuzedavalezede.pdf
    • https://cdn.shopify.com/s/files/1/0427/9785/8972/files/kokod.pdf
    • https://cdn.shopify.com/s/files/1/0463/1799/4149/files/meiosis_worksheet_vocabulary.pdf
    • https://static.usrfiles.com/ugd/b8c837_22d89e09ffd047df98b25af2dc1b2302.pdf
    • https://static.usrfiles.com/ugd/e02969_7ef499f0d4c94ceda94117321fb7ee0f.pdf
    • https://static.usrfiles.com/ugd/2b25b5_d90ac7b8cdc845f49d7bd3de08f2dfef.pdf
    • https://static.usrfiles.com/ugd/b8c837_1b4014c6baa24e85b730d37e90d6527e.pdf
    • https://static.usrfiles.com/ugd/625844_e27930b79069454e91dd9cb46d854601.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_off000064ee.bin
a088325ca436ae03667a8a8da7995fd7137d8a979b25242835af374a774d72bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64EE 5768 bytes
font_01_sfnt_off000078a8.bin
f1ae485cc8cecd23f0837e230c4cb95bf8df51b4058e3640072d88237a6279fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78A8 9884 bytes

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