Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf82f4e6f1c215bd…

MALICIOUS

PDF

43.3 KB Created: 2020-09-19 00:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 016872826fe8094601ea34f35ecab727 SHA-1: 2bd12c873a7e42fd9dbf481070ffe1e397dac799 SHA-256: bf82f4e6f1c215bdf0689fd7dbb5225351d337b7b3ff61d0925b5ea95b64248d
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The link leads to a URL that appears to be part of a link farm, aiming to attract users searching for specific academic materials. The ML classifier strongly indicates maliciousness. The primary IOC is the malicious redirector URL.

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.club/wix?keyword=thermodynamics+solution+manual+5th+edition
    • https://cdn.shopi
    • https://cdn.shopify.com/s/files/1/0439/3231/9899/files/qualitative_analysis_methods.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/buxidumex.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/5081520916.pdf
    • https://b2c305a3-077f-42f6-9bf8-828a0380ec6d.filesusr.com/ugd/1da05d_70fcfd5076bd45cebae5f2e0cea74141.pdf?index=true
    • https://9851d813-15f9-4f19-8b8a-34d95487a4dc.filesusr.com/ugd/4a2613_a7f4ed7f634f4b36a17617a8a2f54fd7.pdf?index=true
    • https://dcbb2e61-d340-4e2b-ae9e-be0c27b22ead.filesusr.com/ugd/822ecd_3b850baf726c4916bf8e70b926fe6e02.pdf?index=true
    • https://841d944c-4936-4166-bcb9-d25d74ba249c.filesusr.com/ugd/681527_882a97f55bcc415a8e4f1e1b42fce875.pdf?index=true
    • https://5b324fe2-020f-4c97-9546-c204a9198c70.filesusr.com/ugd/70e5f7_302206aa714c49c2821e3bbacb4804d8.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/data_analysis_using_excel_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/9357/3288/files/4255495804.pdf
    • https://cdn.shopify.com/s/files/1/0435/4582/1333/files/26817090961.pdf
    • https://cdn.shopify.com/s/files/1/0427/8000/0423/files/pune_road_map.pdf
    • https://cdn.shopify.com/s/files/1/0488/1062/3141/files/tatuajes_para_hombres.pdf
    • https://cdn.shopify.com/s/files/1/0462/2142/6841/files/storyboard_template_pages_mac.pdf
    • https://cdn.shopify.com/s/files/1/0428/8649/6415/files/5e_sword_of_wounding.pdf
    • https://cdn.shopify.com/s/files/1/0440/5710/0453/files/13797249618.pdf
    • https://cdn.shopify.com/s/files/1/0432/4134/1096/files/poemas_de_pablo_neruda_para_enamorar.pdf
    • https://cdn.shopify.com/s/files/1/0438/4063/5042/files/apprendre_le_russe_gratuit.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_off00006226.bin
31c21ba3b3246a0cc5d1ab0ad28230f806f455a244b871cd5d5ce1185abda921
pdf-font-stream PDF embedded font (sfnt) at offset 0x6226 5356 bytes
font_01_sfnt_off00007436.bin
f7fa72c51f12ca7bd3b9655e0a07bf09b025eab57ed38eddb6bc44d2ab10062d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7436 14300 bytes