Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2bb9a4cc5e54917…

MALICIOUS

PDF

52.2 KB Created: 2020-07-22 08:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b21343337f88102a7daf382dff3d4fd2 SHA-1: eb2e4460677f104c3d1a547aa0a484606030911e SHA-256: a2bb9a4cc5e549173cfced2ac56eee237f203a4a39fcbcd7b84e7712721bed70
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to ttraff.ru. This URL is presented to the user as a "Crossfit workout book pdf", indicating a social engineering lure. The document also contains a large number of embedded links, many of which point to Shopify domains, suggesting an attempt to disguise the malicious link within a larger set of seemingly benign content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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/wb?keyword=crossfit%20workout%20book%20pdf
    • http://files.icprights.com/uploads/1/3/1/3/131383826/6118828.pdf
    • http://files.alkistis.net/uploads/1/3/1/0/131070529/426abcf78a5.pdf
    • http://files.sunweeklynews.com/uploads/1/3/1/3/131381658/8652791.pdf
    • http://files.durhamcontractorstx.com/uploads/1/3/1/4/131456012/xitiluwabiziwu-jukemosiso-wanusowedu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53940391871.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6429/files/18422425827.pdf
    • https://cdn.shopify.com/s/files/1/0432/0670/5311/files/kuvewutiradudugajuku.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2335/files/70258871448.pdf
    • https://buzugopi.files.wordpress.com/2020/06/benumatedofabedoledixudop.pdf
    • https://mabavazadir16077034.files.wordpress.com/2020/07/mezakinebutajodisibup.pdf
    • https://lasojunobewe287962433.files.wordpress.com/2020/07/jegadawepanavewedijomun.pdf
    • https://cdn.shopify.com/s/files/1/0428/8996/9820/files/govevesozafopisofa.pdf
    • https://cdn.shopify.com/s/files/1/0437/2119/5669/files/21488902897.pdf
    • https://cdn.shopify.com/s/files/1/0435/3271/4139/files/54976933406.pdf
    • https://cdn.shopify.com/s/files/1/0430/1042/4993/files/97627563521.pdf
    • https://cdn.shopify.com/s/files/1/0430/9821/0461/files/82181073837.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34597476450.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/16946396068.pdf
    • https://cdn.shopify.com/s/files/1/0427/7580/6119/files/46049109408.pdf
    • https://cdn.shopify.com/s/files/1/0429/4174/3263/files/58203007516.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_off00008e73.bin
8222d1e264be28fd343809e786bd95d0c2dad19285e5395b071877182c7911ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E73 4768 bytes
font_01_sfnt_off00009ec6.bin
4b23021342a908ac539408626167b7fb4d78dedad6fafa4f03ea46ae9064d130
pdf-font-stream PDF embedded font (sfnt) at offset 0x9EC6 10892 bytes