Malicious PDF — malware analysis report

Static analysis result for SHA-256 c757f691a6c531c8…

MALICIOUS

PDF

44.9 KB Created: 2020-08-30 14:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39f0e4b13436b34feab20a9301784941 SHA-1: d2dc8eb196b01e5f3cc2c16d5ed25f628582efa2 SHA-256: c757f691a6c531c8e75aa09ab585ed0498cb2ac84e68fa85607ea32b94bb5f75
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with many links pointing to Shopify domains, likely for SEO manipulation. The primary malicious IOC is a redirector URL, https://ttraff.cc/wix?keyword=como+convertir+numeros+decimales+a+binarios, which is linked to malicious infrastructure. The document body, though heavily obfuscated, contains this URL and other Shopify links, suggesting a lure to a malicious site. The ML classifier strongly supports the malicious verdict.

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=como+convertir+numeros+decimales+a+binarios
    • https://cdn.shopify.com/s/files/1/0430/0364/2007/files/jodoxigaromivoze.pdf
    • https://cdn.shopify.com/s/files/1/0432/1889/5010/files/bajusixewefumomaluvimodi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5025/3992/files/sadozovijizonuzuxex.pdf
    • https://cdn.shopify.com/s/files/1/0440/7230/4805/files/diggy_s_adventure_cheats_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vunumegosuvuvorewufo.pdf
    • https://static.usrfiles.com/ugd/36f25b_304cc5febf5a41c6bc2ad97a24a150c2.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/suramagufumaxuragozud.pdf
    • https://cdn.shopify.com/s/files/1/0431/8520/9507/files/best_html5_templates_2018_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/7016/7967/files/redis_install_mac.pdf
    • https://cdn.shopify.com/s/files/1/0429/5137/7049/files/kobozavepe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jatud.pdf
    • https://static.usrfiles.com/ugd/de65f7_98f94c1261eb434f8f711cb4eb2f3e4b.pdf
    • https://static.usrfiles.com/ugd/b8c837_35396f3a25dc4e48b77620c942a71c0f.pdf
    • https://static.usrfiles.com/ugd/f4de5e_f3ff852fa21942a18d705a1fc8167e4f.pdf
    • https://static.usrfiles.com/ugd/54fa57_9964792dfb0745ea9e2a61e62ef2d240.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064fb.bin
4ec312afb7d3e3d79596c84fca825cdffbbafe682ab3278ce96231df949d7210		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64FB 5192 bytes
font_01_sfnt_off0000767c.bin
13678a14b930e6d42e11b2ac41b13981c2c7f5938cc30cfb194ad51886f1f1dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x767C 2092 bytes
font_02_sfnt_off00008021.bin
d1f733492fb94c42c1e00c999254eea6e53cad9c6b1f14f8fc43190999dc2222		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8021 11376 bytes

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