Malicious PDF — malware analysis report

Static analysis result for SHA-256 885ed8913ced08bf…

MALICIOUS

PDF

43.1 KB Created: 2020-08-12 18:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e7a475d36f4d7d6ffce12e3ff46472d SHA-1: ac41630d0b0d33825b2d8abef9f546cdf27c2036 SHA-256: 885ed8913ced08bf81c515ade06a3650d1671e8402434008c2c302fe0b440a8c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with the primary one leading to a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to direct users to malicious infrastructure. The ML classifier strongly indicated maliciousness, supporting the presence of a malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=bach+adagio+bwv+974+piano+pdf
    • http://files.louisianacareerdevelopment.org/uploads/1/3/1/4/131453084/366453.pdf
    • http://files.pottingwithpotter.com/uploads/1/3/1/1/131163969/4698086.pdf
    • http://files.joneswedding.vip/uploads/1/3/0/7/130776386/4903328.pdf
    • http://fofided.educationinno.org/uploads/1/3/1/4/131453109/7769863.pdf
    • http://makaxif.nourishdiy.com/uploads/1/3/1/1/131164250/147720dd4332.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/2307/9323/files/applied_physics_1_first_year_engineering.pdf
    • https://cdn.shopify.com/s/files/1/0437/4275/7029/files/kikatefisetenubak.pdf
    • https://cdn.shopify.com/s/files/1/0438/5649/4757/files/42522121985.pdf
    • https://cdn.shopify.com/s/files/1/0439/8232/3870/files/netbeans_java_gui_builder_tutorial_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0434/9237/6741/files/fapezajitexazolupef.pdf
    • https://cdn.shopify.com/s/files/1/0434/0681/9493/files/95283086364.pdf
    • https://cdn.shopify.com/s/files/1/0431/4388/9058/files/17760536989.pdf
    • https://cdn.shopify.com/s/files/1/0428/9118/2243/files/ravoli.pdf
    • https://cdn.shopify.com/s/files/1/0439/1141/3915/files/viwumazogokiwerud.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72518400380.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/dugabivasujogi.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068ec.bin
34fc25111d3d00d7a0f7e7eb7f302427e9cbee86e70472bb7b7d7748217c4c80
pdf-font-stream PDF embedded font (sfnt) at offset 0x68EC 5776 bytes
font_01_sfnt_off00007cba.bin
9b7507e24cccc10a896a02d26b8a17b5f9e7729e42f05546f8e76248048af05d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CBA 10244 bytes