Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee4f9550a4408dbd…

MALICIOUS

PDF

44.9 KB Created: 2020-08-31 07:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d825e875ebce1ec3481253ae559b5743 SHA-1: 3675714b08d6b88a5952ade8c253f05fc069ca26 SHA-256: ee4f9550a4408dbd38d92b8117abe52817e6341aaea94f515de54be51c55a37b
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for downloading software. This URL, 'https://ttraff.club/wix?keyword=descargar+corel+draw+x3+gratis+para+pc', is the primary IOC. The presence of numerous other links, many pointing to Shopify, suggests a link farm designed to obscure the malicious redirector.

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=descargar+corel+draw+x3+gratis+para+pc
    • https://cdn.shopify.com/s/files/1/0435/4503/4911/files/95597610449.pdf
    • https://cdn.shopify.com/s/files/1/0432/6277/1358/files/gewisitewubajowotaxidekog.pdf
    • https://cdn.shopify.com/s/files/1/0432/3786/7687/files/first_rank_raju_full_movie_movierulz.pdf
    • https://cdn.shopify.com/s/files/1/0437/5294/7873/files/alita_battle_angel_tamil_trailer.pdf
    • https://cdn.shopify.com/s/files/1/0432/9907/8304/files/84035844290.pdf
    • https://cdn.shopify.com/s/files/1/0432/1620/8036/files/manualidades_con_papel_celofan_paso_a_paso.pdf
    • https://cdn.shopify.com/s/files/1/0432/7378/1408/files/aerospace_aerodynamics_aircraft_performance_calculator.pdf
    • https://cdn.shopify.com/s/files/1/0438/8909/8907/files/convert_html_to_c_free.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_fdd1f96a5cf54e24b41eec7573965446.pdf
    • https://static.usrfiles.com/ugd/ade4e6_50e896e634ee48a9861d11ca691f7d38.pdf
    • https://static.usrfiles.com/ugd/b8c837_3242fbb5d0d34c3583bbbcd71ecc4925.pdf
    • https://static.usrfiles.com/ugd/b444d4_24b6801ef9ce4d98931c827eabb6187f.pdf
    • https://static.usrfiles.com/ugd/0d2908_798f7469207c45ca850820284ac1831f.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_off000064bb.bin
deb260b909b706362d2fd008fc876fa0d2cc6815743c4415bf7c7ccffa92e3a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x64BB 5564 bytes
font_01_sfnt_off000077cc.bin
9bc64773caf6053f350f7150c0eb7ba4a889efb4ee122e98115923b5a6f8905a
pdf-font-stream PDF embedded font (sfnt) at offset 0x77CC 15256 bytes