Malicious PDF — malware analysis report

Static analysis result for SHA-256 21dac55d8f07b984…

MALICIOUS

PDF

106.2 KB Created: 2020-08-09 16:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8eaa3bd2028475056a3325bda7f08bd2 SHA-1: 5f9bf202d0000d82568b0563fd48ed173492afea SHA-256: 21dac55d8f07b984ee006517ae5944c264a270ae835b2cd9fd02c5f603fa6773
128 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 of which point to domains that appear to be part of a link farm or SEO manipulation scheme. One critical heuristic identified a link to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the redirector found in the heuristics, suggesting the document's primary purpose is to lure users to malicious sites. No scripts were extracted from this sample.

Heuristics 4

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=curriculum+development+book+by+purita+bilbao+pdf
    • http://files.rcdavis-tellinstories.com/uploads/1/3/1/3/131383624/ebc2656e5828c5.pdf
    • http://files.f-y-t-a.com/uploads/1/3/1/3/131380107/vurimemotosatewedosa.pdf
    • http://noxug.giftsbydeb.com/uploads/1/3/2/7/132741555/bobapolut.pdf
    • http://files.sharaimage.com/uploads/1/3/1/0/131070407/pozaxan.pdf
    • http://files.notsogrownuppodcast.com/uploads/1/3/1/3/131383959/8d3dfa7.pdf
    • https://cdn.shopify.com/s/files/1/0440/7338/6136/files/roll20_token_border.pdf
    • https://cdn.shopify.com/s/files/1/0427/9340/2534/files/davuzedewum.pdf
    • https://cdn.shopify.com/s/files/1/0439/4542/7102/files/pdf_to_word_converter_nitro_online.pdf
    • https://cdn.shopify.com/s/files/1/0432/1751/8751/files/767816103.pdf
    • https://cdn.shopify.com/s/files/1/0432/2046/7869/files/sufex.pdf
    • https://cdn.shopify.com/s/files/1/0432/7899/1520/files/17233372602.pdf
    • https://cdn.shopify.com/s/files/1/0432/8446/3784/files/jajiwowabe.pdf
    • https://cdn.shopify.com/s/files/1/0445/9141/5460/files/comparing_fractions_word_problems_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/8120/3873/files/80964707523.pdf
    • https://cdn.shopify.com/s/files/1/0433/4246/3126/files/55164474516.pdf
    • https://cdn.shopify.com/s/files/1/0429/0897/5263/files/uk_bribery_act_deutsch.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014fa8.bin
405c03d83fc66a8d022fe9b72ed7739d3f5151681b137a42c56e1e0027807689
pdf-font-stream PDF embedded font (sfnt) at offset 0x14FA8 5392 bytes
font_01_sfnt_off000161ee.bin
1c5d8660d580dd3c9c84983a95e6454fcdf95cdca05f95885403374fd58c4a87
pdf-font-stream PDF embedded font (sfnt) at offset 0x161EE 13380 bytes
font_02_sfnt_off00018cfe.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x18CFE 4324 bytes