Malicious PDF — malware analysis report

Static analysis result for SHA-256 bccbfe6486dcfb0c…

MALICIOUS

PDF

34.9 KB Created: 2020-08-29 20:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15326e433ae3d8d7ac9563d2a604b612 SHA-1: c3300dacc5ed1d7b5e721b41fcced77c2a22e3a1 SHA-256: bccbfe6486dcfb0cd168d47c184f2677a9e07b080290f9e077e0e498fe2ea88f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large number of SEO-optimized external PDF links. The primary malicious URL identified is ttraff.com, which is known to host redirector infrastructure. The document body contains garbled text and a reference to the malicious URL, suggesting it is part of a link farm designed to lure users to malicious sites.

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=lfs+abart%25C4%25B1+egzoz+yamas%25C4%25B1+indir+tamindir
    • https://static.usrfiles.com/ugd/b8c837_efab7b681d9a43dfa11e5b6b10af5f43.pdf
    • https://static.usrfiles.com/ugd/b56239_b6eb492c6d254716b570d019ed9db41b.pdf
    • https://static.usrfiles.com/ugd/b8c837_e0b44587f97740989ac55e2308e7d60f.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e8b58bd82aa49dc92c738dd33a65d70.pdf
    • https://static.usrfiles.com/ugd/469aea_c959a5712d9f4d4e9f1276d7c5a15099.pdf
    • https://cdn.shopify.com/s/files/1/0434/8562/6520/files/69766989110.pdf
    • https://cdn.shopify.com/s/files/1/0458/1520/1958/files/miwejosiwunoruvajuw.pdf
    • https://static.usrfiles.com/ugd/b8c837_90c7aff6dd964f1cb3dd8664412ccc6e.pdf
    • https://static.usrfiles.com/ugd/b8c837_3c622c49dabb4de4b7def7e7416de840.pdf
    • https://static.usrfiles.com/ugd/15cd4d_6f12f99ff48e4a1c9f7d7d2ce735dafc.pdf
    • https://static.usrfiles.com/ugd/12f4eb_fdee34894e8b40ee8084787fd414ede4.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd645dfcb9004143a539970338609758.pdf
    • https://cdn.shopify.com/s/files/1/0429/6730/2295/files/absurdism_in_the_stranger.pdf
    • https://cdn.shopify.com/s/files/1/0434/0819/5738/files/charlottes_web_full_book.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_off00004701.bin
8bc9088a15527ed5a5c00a13e9218793eca200458d3da82116438cbcb66865ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x4701 5460 bytes
font_01_sfnt_off0000598d.bin
6e4c737988f2190dd811cd4236e517fe8052a23786ee5dca82da7b7543f5527a
pdf-font-stream PDF embedded font (sfnt) at offset 0x598D 11108 bytes