Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a28e433e36e3b6…

MALICIOUS

PDF

46.8 KB Created: 2020-08-31 05:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7dddedc456f9b46438ed60a07d81a2b SHA-1: 72b6cb281df779f8100a8af7534eeaae2755f8ff SHA-256: a1a28e433e36e3b6ee9b6b8aaeab3011d9afb1c361ad8841d5ab3f3f5dcf1e47
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The presence of a link farm suggests an attempt to distribute malicious content or phish users. No scripts were extracted, limiting the analysis of specific execution behaviors.

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/wix?keyword=cantique+de+sim%2525C3%2525A9on+partition
    • https://static.usrfiles.com/ugd/764aaa_afb59d9b92034a1c9f13ad614bc929d9.pdf
    • https://static.usrfiles.com/ugd/b8c837_428cec0b543d4fd7a34cd88414831e33.pdf
    • https://static.usrfiles.com/ugd/b8c837_1008a45a4ba04f238430997608bf6140.pdf
    • https://static.usrfiles.com/ugd/b8c837_6f42116102f64ca3866508ef0553202b.pdf
    • https://static.usrfiles.com/ugd/0c41e7_13764ad21891441e89d9e1bbd261bf4c.pdf
    • https://cdn.shopify.com/s/files/1/0433/0710/6462/files/fuwikevazezur.pdf
    • https://static.usrfiles.com/ugd/55f640_3b955028c4dd433480e429d3adfbe3b3.pdf
    • https://static.usrfiles.com/ugd/1813b3_fec3b13c106d42e9a5929636c5296310.pdf
    • https://static.usrfiles.com/ugd/b8c837_66e615173dc842f485a4b6990aa8b426.pdf
    • https://static.usrfiles.com/ugd/217d68_83eac6399fec4bf9b01c87350c6f0286.pdf
    • https://static.usrfiles.com/ugd/87fdc7_c70e117376b148d3bd28f86bf3842896.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_off00007ad6.bin
be69d66b2a22b96d6b904719ca729e83f2e9ab34545d375cc80ff782773fc572		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AD6 5244 bytes
font_01_sfnt_off00008c45.bin
154d11c0517707c1519165d0d836650998addf4f9e9a001a62019d2bc91bb55d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C45 9384 bytes

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