Malicious PDF — malware analysis report

Static analysis result for SHA-256 c99b061e7293ece9…

MALICIOUS

PDF

45.3 KB Created: 2020-08-07 18:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9eb464fe7c881a28ef72dee792a455f7 SHA-1: 835bdb62ce2222bc8375071cb908fe262748bda1 SHA-256: c99b061e7293ece97ffffd2fddc544676092b8f096e544ad0612b1342bcd50bb
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised with keywords related to 'brachytherapy cervical cancer', likely intended to lure victims to a malicious site. The PDF also hosts a large number of other links, many pointing to Shopify domains, suggesting a link farm or SEO poisoning tactic. No scripts were extracted from this sample, but the presence of the malicious redirector and the ML classifier's high confidence indicate a malicious intent to redirect users to harmful content.

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.com/pify?keyword=brachytherapy+cervical+cancer+pdf
    • http://files.newspringscommunity.org/uploads/1/3/1/3/131384127/2837e2725.pdf
    • http://kupad.optimumgolfstore.com/uploads/1/3/2/6/132680813/1306626.pdf
    • http://files.albernifirstaid.com/uploads/1/3/0/8/130813645/vowabopijetat.pdf
    • http://files.kantishnaouterwear.com/uploads/1/3/0/7/130776887/7229470.pdf
    • http://files.hephaestus6390.com/uploads/1/3/2/6/132695416/1150e.pdf
    • https://cdn.shopify.com/s/files/1/0437/0599/1322/files/bloodborne_little_girl.pdf
    • https://cdn.shopify.com/s/files/1/0435/4031/6319/files/lasigosijumegidab.pdf
    • https://cdn.shopify.com/s/files/1/0432/2862/7107/files/sql_tutorial_for_beginners_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/6083/6005/files/purble_place_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/1804/2018/files/84826896768.pdf
    • https://cdn.shopify.com/s/files/1/0429/5196/6873/files/81245553378.pdf
    • https://cdn.shopify.com/s/files/1/0437/0432/0154/files/vinikuzudurojaze.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/98872210255.pdf
    • https://cdn.shopify.com/s/files/1/0429/8525/9159/files/8128379909.pdf
    • https://cdn.shopify.com/s/files/1/0439/8995/8814/files/41097532896.pdf
    • https://cdn.shopify.com/s/files/1/0429/5298/2684/files/78483836292.pdf
    • https://cdn.shopify.com/s/files/1/0435/6263/1326/files/fukajitadefopan.pdf
    • https://cdn.shopify.com/s/files/1/0447/5686/1077/files/work_smarter_not_harder_book_download.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_off000072bf.bin
265dc25bd940fec8ff4f825726f11a5fb39b3c430bc3262910ded0c13da1e102
pdf-font-stream PDF embedded font (sfnt) at offset 0x72BF 5276 bytes
font_01_sfnt_off000084bf.bin
72574a958fd19922e313848b0e685c3d11a69f4fd1a0ef203248cb1d117627f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x84BF 10208 bytes