Malicious PDF — malware analysis report

Static analysis result for SHA-256 6762b153e1f4f97f…

MALICIOUS

PDF

43.0 KB Created: 2020-09-05 15:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e93386385f342aba90d0e869a8dbe9e SHA-1: 4f7d1d021cc3529fe56e6a7c18944f1a8a7b467c SHA-256: 6762b153e1f4f97fdbf96da54b8038d80ff0df8b854eacae534a2d0a7ca7ac54
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 PDF files, suggesting a link farm or SEO abuse tactic. One prominent URL, 'https://ttraff.link/wix?keyword=free+template+website+responsive', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same lure and URLs, reinforcing the malicious intent to redirect users to potentially harmful content.

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.link/wix?keyword=free+template+website+responsive
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/771ea4_507d31d1f67b4ffba6a191641c762be7.pdf
    • https://static.usrfiles.com/ugd/625844_8707bb8259fb48f8a8da6837217b2570.pdf
    • https://static.usrfiles.com/ugd/7041e4_ab1eea3125e1463aa7f55f5017bf9b6e.pdf
    • https://cdn.shopify.com/s/files/1/0450/6501/1352/files/guia_ceneval_medicina_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0434/4902/4669/files/74831372978.pdf
    • https://cdn.shopify.com/s/files/1/0435/6138/6147/files/62390882683.pdf
    • https://cdn.shopify.com/s/files/1/0430/7927/0549/files/piseniv.pdf
    • https://cdn.shopify.com/s/files/1/0427/4677/3660/files/android_tv_stock_rom.pdf
    • https://static.usrfiles.com/ugd/c618e9_63b27fb0c8b44cb98d151307a040907e.pdf
    • https://static.usrfiles.com/ugd/51c472_16a0305fdd644f67af0a8b2a7cccb84f.pdf
    • https://static.usrfiles.com/ugd/bf57b5_0e13f3b016ca4e7992e4067192ce3c80.pdf
    • https://static.usrfiles.com/ugd/36f25b_4173e49988964bf681a05d69019e13ee.pdf
    • https://static.usrfiles.com/ugd/2f3ac6_57b5eafd3e064a98bfacd4c44ecd35f5.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000608b.bin
9862f8db536c223f3582a2ddf6fd20fa9a32ce11b76afc023b608db6a6b79c9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x608B 5212 bytes
font_01_sfnt_off00007235.bin
2b17894289ef4ac549ca5ccbfe538e6ebde94701791c0542cba9a71f2d67f349		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7235 2268 bytes
font_02_sfnt_off00007c48.bin
5a5f8ff9d5d349079e9c955704a732653d58d9edd8c0b1242d6600d362b6428d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C48 10120 bytes

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