Malicious PDF — malware analysis report

Static analysis result for SHA-256 781c7ae3eac8faf3…

MALICIOUS

PDF

39.7 KB Created: 2020-08-30 11:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7eeda9f0c369356bf42c44e659c3ee3 SHA-1: a1c70dba9422ca0a4b41b8fc45477791f63a477c SHA-256: 781c7ae3eac8faf3ba217dd8a091d5ec7b9605ee5a9e51c942bcad9ed827f9f2
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.com'. It also exhibits characteristics of a PDF link farm, with numerous embedded links, many of which lead to benign Shopify URLs but one critical redirector. The document body, though heavily obfuscated, contains text related to 'educating exceptional students' and a URL, suggesting a lure to a malicious site. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=educating+exceptional+students+14th
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7764/8027/files/wuxadosefowilip.pdf
    • https://cdn.shopify.com/s/files/1/0436/5503/7078/files/wenaxotowexexuvedavoxe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tanedikefiresemur.pdf
    • https://cdn.shopify.com/s/files/1/0431/1659/3312/files/57996936579.pdf
    • https://cdn.shopify.com/s/files/1/0450/2552/5918/files/d_d_advantage.pdf
    • https://static.usrfiles.com/ugd/b8c837_65257470cdfa4353843b286775c9c074.pdf
    • https://static.usrfiles.com/ugd/04e6f9_c6d304bb08984c3ab2b5cb5842cdcb05.pdf
    • https://static.usrfiles.com/ugd/ef7b09_003d466599f346b198c416895f69630d.pdf
    • https://static.usrfiles.com/ugd/b8c837_05c51dcbf4d74074a459d27da6beca0b.pdf
    • https://static.usrfiles.com/ugd/0c4177_e9ace190548d4d78b51bac75528dddbc.pdf
    • https://static.usrfiles.com/ugd/b47706_c1a5aa2a88c3470999b7733efa714c8c.pdf
    • https://static.usrfiles.com/ugd/b47706_14d250c5d72448009f0083b95da80e28.pdf
    • https://static.usrfiles.com/ugd/57c819_d68db166546a49328bc95483b6927d91.pdf
    • https://static.usrfiles.com/ugd/b8c837_b92030c7ddb24f22bdaf166238472d78.pdf
    • https://cdn.shopify.com/s/files/1/0434/4388/0103/files/indesign_storyboard_template.pdf
    • https://cdn.shopify.com/s/files/1/0438/4840/1046/files/97861682970.pdf
    • https://cdn.shopify.com/s/files/1/0440/6122/9206/files/alpinia_galanga.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_off00005c1a.bin
a46862cf31c05842fc29db6386e57b9fc29756e3ba1e51853d179382f694f495		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C1A 5404 bytes
font_01_sfnt_off00006e86.bin
f25207d32e219a9055af7e45b2fb5eed07f63a97a6281dd1def09f4b632f4545		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E86 10256 bytes

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