Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0dccfbe6a845f4f…

MALICIOUS

PDF

40.3 KB Created: 2020-08-22 14:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c5ded2bf15d73ea65e47236a702c473 SHA-1: ede1f9798870b93e96081c2b1d017fe3cd1211f9 SHA-256: c0dccfbe6a845f4f22ba0e051f1ffd7f4f16d74bcef5911bec3d6d5dce1adf45
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, disguised as a free sheet music download. The ML classifier strongly indicates maliciousness. The document body and embedded link structure suggest a social engineering lure to redirect the user to a malicious site.

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.ru/pify?keyword=free+printable+country+sheet+music+for+keyboard
    • http://files.michaelbradleyatty.com/uploads/1/3/2/6/132683165/lugavuzuv-gitunatugol-nobujajerirewa-loxun.pdf
    • https://cdn.shopify.com/s/files/1/0429/6717/1223/files/dekolapabu.pdf
    • https://cdn.shopify.com/s/files/1/0428/5038/6079/files/dejen.pdf
    • https://cdn.shopify.com/s/files/1/0431/5188/4445/files/84540468453.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/viborovikumowenaben.pdf
    • https://cdn.shopify.com/s/files/1/0431/9733/3668/files/7592545945.pdf
    • https://cdn.shopify.com/s/files/1/0428/6545/9366/files/49829309480.pdf
    • https://cdn.shopify.com/s/files/1/0433/3145/3081/files/skyrim_cheats_codes_xbox_360.pdf
    • https://cdn.shopify.com/s/files/1/0436/1181/6099/files/griffiths_harris_algebraic_geometry.pdf
    • https://cdn.shopify.com/s/files/1/0428/6906/3836/files/92025425424.pdf
    • https://cdn.shopify.com/s/files/1/0432/3622/9278/files/mitumimeliwejot.pdf
    • https://cdn.shopify.com/s/files/1/0428/6044/5855/files/dujekuw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9173/9295/files/5487115651.pdf
    • https://cdn.shopify.com/s/files/1/0433/5858/4986/files/campus_recruitment_training_books.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_off00005e7a.bin
b600b95731f3fcb77584b8e81a0fb8d1b0fb8c28370c6e04b0d62ede4dcd8a90
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E7A 5656 bytes
font_01_sfnt_off0000717d.bin
4b8da98769e4bbb51fa64171e131fc4266b81d55b9d5dd09a73b93bff14419ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x717D 10240 bytes