Malicious PDF — malware analysis report

Static analysis result for SHA-256 937cd83e2d4fae87…

MALICIOUS

PDF

50.6 KB Created: 2020-08-04 18:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd8d9cde1ef0aab85e70a47c0f7d8a7d SHA-1: cd4725cbf20ff12d7c9a76fc36414df2ffae19b8 SHA-256: 937cd83e2d4fae87413e650d972e23a3ede80c02bcc41aefe7ecc9332996b610
152 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to a redirector service. The primary malicious URL identified is https://ttraff.cc/pify?keyword=chemistry+notes+for+class+11+pdf, which is likely used to funnel victims to a malicious payload. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests a SEO-based lure to attract victims searching for educational materials.

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.cc/pify?keyword=chemistry+notes+for+class+11+pdf
    • http://files.monsoonblooms.com/uploads/1/3/0/7/130775092/4910760.pdf
    • http://files.mcearlychildhoodprogram.com/uploads/1/3/1/8/131871633/016078a8478c894.pdf
    • http://files.emmanuelyork.org/uploads/1/3/0/8/130814633/7424754.pdf
    • http://files.mdeasonphotography.com/uploads/1/3/1/4/131454316/rumidomutisufo-kudowu-kogoluwewimewaj-gofazerebi.pdf
    • http://files.nathanwolff.com/uploads/1/3/1/8/131856308/nokudefe-jotir-jigixisad-fipaweder.pdf
    • https://cdn.shopify.com/s/files/1/0435/7403/4600/files/18779583041.pdf
    • https://cdn.shopify.com/s/files/1/0429/7143/1065/files/65918947492.pdf
    • https://cdn.shopify.com/s/files/1/0437/3151/7592/files/identifying_alliteration_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/8052/3678/files/93135247217.pdf
    • https://cdn.shopify.com/s/files/1/0441/0081/2952/files/2351733805.pdf
    • https://cdn.shopify.com/s/files/1/0440/8619/8424/files/23271779704.pdf
    • https://cdn.shopify.com/s/files/1/0428/7453/6103/files/62516624392.pdf
    • https://cdn.shopify.com/s/files/1/0435/4693/5447/files/gozipapasawu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0265/0020/files/1128013211.pdf
    • https://cdn.shopify.com/s/files/1/0439/2094/9403/files/cerebro_reptiliano_humano.pdf
    • https://cdn.shopify.com/s/files/1/0433/5806/0703/files/98730296035.pdf
    • https://cdn.shopify.com/s/files/1/0427/5293/4044/files/8966202900.pdf
    • https://cdn.shopify.com/s/files/1/0433/9394/1671/files/70956134140.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/
    • https://cdn.shopify.com/s/files/1/0437/3151/7592/files/identifying_alliteration_wor

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000086e6.bin
349f1fd2eaa78adbc612241da56fb95bded78f3cd535036b5191290584303d06
pdf-font-stream PDF embedded font (sfnt) at offset 0x86E6 5452 bytes
font_01_sfnt_off00009950.bin
0cf6baeb481d39c07ee6bfcd8c697967306433aed11d7b8ea607dde5e70bc4b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x9950 10456 bytes