Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa610f6830ef175…

MALICIOUS

PDF

43.5 KB Created: 2020-09-01 02:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1daac520519444e2606517fa66af0aac SHA-1: d297a21ade360376581cc9dfe2ba48b8bb9d69ef SHA-256: 6aa610f6830ef1756836fa685093d27b756d9b0253fc10df99401417586fee00
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDFs, suggesting a link farm for SEO manipulation or to distribute malicious content. One of the primary links, https://ttraff.ru/wix?keyword=rails+form+boolean+radio+button, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and URLs, further supporting a malicious intent.

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.ru/wix?keyword=rails+form+boolean+radio+button
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/8e1900_b00a3427078444128d4a2ef126c856f6.pdf
    • https://static.usrfiles.com/ugd/10e3af_0575c0053e8840bb8c2e7fda78180d1e.pdf
    • https://static.usrfiles.com/ugd/5fd5c1_b907db2891004c47b2310def4326dace.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_5a381a2995ff4de7aba7fc0875e0c48c.pdf
    • https://cdn.shopify.com/s/files/1/0435/6803/8049/files/watub.pdf
    • https://cdn.shopify.com/s/files/1/0428/8184/3353/files/34279979631.pdf
    • https://cdn.shopify.com/s/files/1/0429/9508/9559/files/curso_alemao_basico.pdf
    • https://cdn.shopify.com/s/files/1/0431/4877/1477/files/cricket_mobile_game.pdf
    • https://static.usrfiles.com/ugd/a86d68_6cef015ffc8148d9b2664ba218b72579.pdf
    • https://static.usrfiles.com/ugd/ea9bdf_b32893bb638a4ce7a5104aab833d3679.pdf
    • https://static.usrfiles.com/ugd/b8c837_f71dee7c754c49a1b475d2b705e2bff9.pdf
    • https://static.usrfiles.com/ugd/99965f_0f7d6769b4c6476da67c2cc4cf23ed8d.pdf
    • https://static.usrfiles.com/ugd/c068f8_d0c92ac4a46c4bdfbb7774c057be6527.pdf
    • https://static.usrfiles.com/ugd/911c12_75b3126642ea40529de80dcac871aed2.pdf
    • https://static.usrfiles.com/ugd/756799_4a969968d56b4ea0b4efb4d241f0e3e9.pdf
    • https://static.usrfiles.com/ugd/b56239_30042b0174734f78bac04bc399026da1.pdf
    • https://static.usrfiles.com/ugd/e3325f_3ff9afbb5aad47d2ae19b8dbe08c362e.pdf
    • https://static.usrfiles.com/ugd/b8c837_c064f48203fc4112bd9e96fab972b9f6.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_off00006669.bin
ca176872ea31c1726270dccab357e11d4011946fb5a74ae939285cb412b15099		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6669 5200 bytes
font_01_sfnt_off00007804.bin
2b8b3840d48d3887121401f1fa4f0937c561af24e0ab728541cebe3623b467cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7804 12576 bytes

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