Malicious PDF — malware analysis report

Static analysis result for SHA-256 d83f6a306535854c…

MALICIOUS

PDF

54.5 KB Created: 2020-08-26 19:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aef4d8763e5f4585c74d13344c0fda9b SHA-1: 1df215176e7df6339b4551b029fc349dbd86a503 SHA-256: d83f6a306535854cfc722fc9d7b5128620891cd490a97c14b36564f601e38ed7
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The embedded URL `https://ttraff.cc/pify?keyword=interpreta%25C3%25A7%25C3%25A3o+de+exames+laboratoriai` is a known malicious redirector. The document body, though partially corrupted, contains references to laboratory exams and the wkhtmltopdf tool, suggesting a lure. The primary attack pattern involves redirecting users through a network of links, likely leading to malicious 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.cc/pify?keyword=interpreta%25C3%25A7%25C3%25A3o+de+exames+laboratoriai
    • http://numuwulir.information4felons.com/uploads/1/3/2/6/132695601/sexulotarawu.pdf
    • http://wifalubiv.gvrshow.com/uploads/1/3/0/7/130776054/demaxadugevupu.pdf
    • http://files.saltysouthernroute.com/uploads/1/3/1/4/131453451/6530371.pdf
    • http://widajufi.depthstiny.com/uploads/1/3/0/8/130814579/jajuvabegojenoj.pdf
    • http://files.raymondbassmasters.com/uploads/1/3/1/0/131070689/vamekata_lugezese_kidojoxepoxoza_masavom.pdf
    • https://cdn.shopify.com/s/files/1/0430/2995/4721/files/70394425561.pdf
    • https://cdn.shopify.com/s/files/1/0433/1290/6405/files/refoxosefujikudenedu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3595/1257/files/wogimiguzaxugazifajebij.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fimovubonivunab.pdf
    • https://cdn.shopify.com/s/files/1/0432/3092/0871/files/mevimelubileguzomenujoji.pdf
    • https://cdn.shopify.com/s/files/1/0427/7354/5116/files/25829132406.pdf
    • https://cdn.shopify.com/s/files/1/0431/9700/5981/files/xajubamulasajotu.pdf
    • https://cdn.shopify.com/s/files/1/0435/1967/2472/files/71120219871.pdf
    • https://cdn.shopify.com/s/files/1/0427/6197/8023/files/34621298885.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8184/files/1772683703.pdf
    • https://cdn.shopify.com/s/files/1/0431/6564/7012/files/vusujawuzas.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a25.bin
12af53947455b4c629ab00439c8db773e2ce36276daa98f3df4329d62229f3f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A25 5536 bytes
font_01_sfnt_off00008c35.bin
a96e741a81511ddd13222bb80123743b20f26d4424f0afc667a3b71dc55df3a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C35 17100 bytes
font_02_sfnt_off0000bcf6.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF6 4324 bytes