Malicious PDF — malware analysis report

Static analysis result for SHA-256 753df0d002793248…

MALICIOUS

PDF

49.9 KB Created: 2020-09-04 02:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78f33e6455e554ded8c872ed1728764d SHA-1: d1e78d80073b576c879fd300ddeaed45764413ac SHA-256: 753df0d00279324884dd39263850e748942ac140194bf96554504f219addb146
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, ttraff.club, which is disguised with keywords related to medical guidelines. The document body, though heavily obfuscated, contains the same URL. The presence of numerous other PDF links suggests a link farm or SEO poisoning attempt to drive traffic to malicious sites. No scripts were extracted, but the primary malicious behavior is the redirection to a harmful URL.

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.club/wix?keyword=american+heart+association+guidelines+antibiotic+prophylaxis+dental
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/3d7af5_9b05088cd05944b49e8c140831f7b75b.pdf
    • https://static.usrfiles.com/ugd/952c2e_7ed43d64240d4603a9fe8d3b6024f055.pdf
    • https://static.usrfiles.com/ugd/384ea4_86a6041c009740c88b603df999507642.pdf
    • https://static.usrfiles.com/ugd/ca300b_4cdff75503484558b758835709af603c.pdf
    • https://static.usrfiles.com/ugd/7e84b7_3a33978780d747dfbdebb77f376bf2ef.pdf
    • https://cdn.shopify.com/s/files/1/0433/6621/9941/files/79389805244.pdf
    • https://static.usrfiles.com/ugd/bae0a0_e5d71faaedf746aea1bf551b7ab6f312.pdf
    • https://static.usrfiles.com/ugd/bfd504_fea46aef39d047f58c5c4eb5e5a30f64.pdf
    • https://static.usrfiles.com/ugd/b8c837_2e0839b1a2534d9abba6fd66bce1cfb6.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_39a22cfdcfd14f5d9ae1e73cec37c97d.pdf
    • https://static.usrfiles.com/ugd/4fea5c_ce19c42995cd4b73ba8fbf1206e0399b.pdf
    • https://cdn.shopify.com/s/files/1/0431/3969/4741/files/musica_nueva_para_descargar_mp3teca.pdf
    • https://cdn.shopify.com/s/files/1/0431/3225/6407/files/some_stuffs_jojo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0591/0935/files/55648652097.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_off0000826b.bin
dbbc642f31080939ba4dfd38e9191a5d3b0a642d6055f108c68200d9bceb542c
pdf-font-stream PDF embedded font (sfnt) at offset 0x826B 5784 bytes
font_01_sfnt_off000095fa.bin
9c23b381d400862410caa2fffe54ca9dca3b8258b649d01d386b784ae67629bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x95FA 10640 bytes