Malicious PDF — malware analysis report

Static analysis result for SHA-256 59f0794dd3a79a12…

MALICIOUS

PDF

44.8 KB Created: 2020-08-10 22:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab9ee36bb2406e6d501ccd50e0387314 SHA-1: c8466506efc4f73fb35b23723d7cb72be338a7dc SHA-256: 59f0794dd3a79a128461dca5dea98cdd01229c85a4198c16ab387f5bc4abf5e8
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The primary malicious URL identified is https://ttraff.ru/pify?keyword=definite+article+the+rules+pdf. The document body, though heavily obfuscated, contains this URL and other links pointing to a large number of PDFs hosted on Shopify, suggesting a link farm or SEO poisoning attempt. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=definite+article+the+rules+pdf
    • http://files.bdgapparel.com/uploads/1/3/1/3/131382092/1173770.pdf
    • http://files.ideamater.rafaelfraga.com/uploads/1/3/1/4/131483371/fa1fc8ca39231e.pdf
    • http://files.designsbykneeknee.com/uploads/1/3/0/7/130776046/jesopevol.pdf
    • http://files.kathrynrobertsauthor.com/uploads/1/3/2/6/132681757/efbddc0.pdf
    • http://jufuleto.jenniferrpark.com/uploads/1/3/0/8/130874218/vavaxol-warewik-kugexowisisa-zopilidimejil.pdf
    • https://cdn.shopify.com/s/files/1/0434/1871/4264/files/zupupitawazawuzijipetuv.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9870/files/xozixexafuzotenenuk.pdf
    • https://cdn.shopify.com/s/files/1/0432/7954/8574/files/87519107351.pdf
    • https://cdn.shopify.com/s/files/1/0444/3871/6583/files/robotics_books_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/6290/9335/files/nokerit.pdf
    • https://cdn.shopify.com/s/files/1/0440/1538/6789/files/quantum_q6_edge_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/6350/9141/files/64282173210.pdf
    • https://cdn.shopify.com/s/files/1/0429/9508/9559/files/andreas_moritz_liver_flush.pdf
    • https://cdn.shopify.com/s/files/1/0436/1935/2740/files/pidirevabozonobanu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5060/5461/files/jagumubunomozulaxupipibom.pdf
    • https://cdn.shopify.com/s/files/1/0432/4956/5853/files/biology_eoc_practice_test.pdf
    • https://cdn.shopify.com/s/files/1/0431/9464/6689/files/xafiwedasopusaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/6269/7894/files/9619450249.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_off00006f3a.bin
2e8485a5907ea4ff255313f5f6b64991e66089be36559d25db389af498ba5fde
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F3A 5240 bytes
font_01_sfnt_off00008101.bin
a4b19fdf5fc8d9988c8ecfad41619ebde1b986201887716cd65086bcf63b0fe3
pdf-font-stream PDF embedded font (sfnt) at offset 0x8101 10756 bytes