Malicious PDF — malware analysis report

Static analysis result for SHA-256 d52928f56661c881…

MALICIOUS

PDF

33.0 KB Created: 2020-08-10 17:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b841bdf66184b96c09dacc866e53400c SHA-1: bd00b7886d392ea6c08320c2c189e03d1f42e635 SHA-256: d52928f56661c881250e814a5870b2222989a006231bbe4b0eff1f06d0b20d69
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to what appears to be a link farm designed to obscure malicious destinations. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=passive+voice+simple+present+worksheet+pdf'. The document body, though heavily obfuscated, contains references to 'passive voice simple present worksheet pdf', suggesting a lure to disguise the malicious intent. The ML classifier also strongly indicated maliciousness.

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=passive+voice+simple+present+worksheet+pdf
    • http://vukiw.uaphialphadelta.com/uploads/1/3/1/6/131636725/malorirumadaloj.pdf
    • http://files.khasy.com/uploads/1/3/0/7/130740249/2393383.pdf
    • http://files.frostbottomstudio.com/uploads/1/3/1/3/131383318/xuxuv.pdf
    • http://files.whiskeybenttradingco.com/uploads/1/3/1/3/131398406/fokolaxogesemip_wupoguvi_malimekojoxesa_zanamabujej.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46391305542.pdf
    • https://cdn.shopify.com/s/files/1/0434/1514/2551/files/mpc_software_2._0_crack.pdf
    • https://cdn.shopify.com/s/files/1/0431/8475/0743/files/kiran_prakashan_synonyms_and_antonyms.pdf
    • https://cdn.shopify.com/s/files/1/0428/6310/0070/files/43750158756.pdf
    • https://cdn.shopify.com/s/files/1/0435/3412/3160/files/mixenolosojulatugegifexu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6112/5013/files/algebraic_expression_worksheets_8th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0431/1498/7674/files/dujawasupuzegetubelej.pdf
    • https://cdn.shopify.com/s/files/1/0433/9925/0072/files/86618648987.pdf
    • https://cdn.shopify.com/s/files/1/0433/8273/5006/files/ragijutewamexojom.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_off0000438d.bin
9d9a8bad3f442a4ff2ba1d7364bed2e30f041e56eca4b58fc9dba91c8ae9dd25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x438D 5612 bytes
font_01_sfnt_off00005686.bin
1b60b914b055f95d2da847a09cd0ae981543d069ac9990030045478971965638		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5686 9548 bytes

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