Malicious PDF — malware analysis report

Static analysis result for SHA-256 c882529c8cfff662…

MALICIOUS

PDF

41.8 KB Created: 2020-08-06 17:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c14497170ab8b25a6a1301db0bf47816 SHA-1: 3e6fb48725f594a9b0e3cfb0f5398bfc95023ba9 SHA-256: c882529c8cfff662fc22514006cbf9ff62e94f750c158b0673465040575417fd
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a large number of embedded links, many of which point to external resources, including a known malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a link to 'ttraff.cc', indicating a redirection to malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though partially garbled, contains text related to 'Bollard pull test pdf' and references 'wkhtmltopdf', suggesting a lure document designed to host numerous links. The primary attack pattern involves directing users to potentially harmful websites.

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=bollard+pull+test+pdf
    • http://zujowofel.shimmersinthesand.com/uploads/1/3/2/6/132681556/xidijuj.pdf
    • http://files.educatesudan.com/uploads/1/3/1/4/131453536/lepepevaja-kofuzogunibil-tovifugef-lojikin.pdf
    • http://files.dontcrampourstyle.com/uploads/1/3/1/4/131407665/lemefemidunu-kemefol-sosebetanumir-xojerogibos.pdf
    • http://files.elcz.co.zw/uploads/1/3/0/7/130739238/bc6dab3.pdf
    • https://cdn.shopify.com/s/files/1/0434/7068/4317/files/6183571565.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65529241957.pdf
    • https://cdn.shopify.com/s/files/1/0437/7824/4765/files/accounting_entries_in_sap.pdf
    • https://cdn.shopify.com/s/files/1/0429/1058/0899/files/67675284810.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xawifakupubegezixezo.pdf
    • https://cdn.shopify.com/s/files/1/0437/8283/2280/files/71938883957.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/tumetimirube.pdf
    • https://cdn.shopify.com/s/files/1/0429/9702/2871/files/85669517368.pdf
    • https://cdn.shopify.com/s/files/1/0431/8894/5064/files/vexolak.pdf
    • https://cdn.shopify.com/s/files/1/0429/8558/6849/files/wiraguguvusewazumo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/bridges_in_mathematics_grade_3_student_book.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_off00006561.bin
7b6747af39ac96b415980fd620665c6ef5a18a422df8366d9d718cc6b5325747
pdf-font-stream PDF embedded font (sfnt) at offset 0x6561 5084 bytes
font_01_sfnt_off000076bb.bin
aa7cc996f837cf381d4a0fa34119050e93893f0e5dc1ebf30d4f366c077d986d
pdf-font-stream PDF embedded font (sfnt) at offset 0x76BB 10348 bytes