Malicious PDF — malware analysis report

Static analysis result for SHA-256 12fc97c9c6ffcffd…

MALICIOUS

PDF

40.9 KB Created: 2020-08-31 13:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc552ed03784fac59e86c769d0b24c48 SHA-1: 47b1b50db372386f73c21cfca572043298552ab6 SHA-256: 12fc97c9c6ffcffd5b35bd7629209cf152cece358c44efe0cacc9ee105855cd0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.cc'. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/wix?keyword=what+is+a+metaphor+worksheet', suggesting a lure to a malicious site. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded links to other PDFs, many hosted on Shopify. The ML classifier also strongly indicated maliciousness.

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.cc/wix?keyword=what+is+a+metaphor+worksheet
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2144/2977/files/gustavo_adolfo_becquer_poemas.pdf
    • https://cdn.shopify.com/s/files/1/0432/3537/7307/files/mutesapolawofiloxuzuteg.pdf
    • https://cdn.shopify.com/s/files/1/0431/1767/4656/files/53008664462.pdf
    • https://cdn.shopify.com/s/files/1/0440/4045/4294/files/animorphs_book_17.pdf
    • https://cdn.shopify.com/s/files/1/0435/0948/1624/files/89206763129.pdf
    • https://static.usrfiles.com/ugd/ad2ade_f65f7dd0135846ec9091e84c1f6ad5e8.pdf
    • https://static.usrfiles.com/ugd/590778_73388ac323e34c0ba3d6826bb4e47514.pdf
    • https://static.usrfiles.com/ugd/b8c837_8bc87731a82d48708873da3b9bc1b9ed.pdf
    • https://static.usrfiles.com/ugd/ca32a8_fa29df25d95841a58d7d03f467bef581.pdf
    • https://static.usrfiles.com/ugd/b8c837_b7101a2ca2584c46b020b3c9b8338874.pdf
    • https://static.usrfiles.com/ugd/c1108c_7ec76627699a4bcf9c255faacd895382.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_off0000623f.bin
8dbfa895b210e34c096fc2557b6bad6c71c251d10fdc8279037bc9e56477b1e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x623F 5196 bytes
font_01_sfnt_off000073d5.bin
d9561e8ef772f6f0ac681477d9d0e4e4272d9181b828437c6758976fe2d52032
pdf-font-stream PDF embedded font (sfnt) at offset 0x73D5 10364 bytes