Malicious PDF — malware analysis report

Static analysis result for SHA-256 176219e6f581f6b1…

MALICIOUS

PDF

54.4 KB Created: 2020-09-03 00:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2cae3e9f9aee45b3aa938847dc5ac231 SHA-1: 31ee4748fbf0d265456bc58644e33215e8bd586a SHA-256: 176219e6f581f6b13a505519809474f91ecb0a4e2feb2ce633860544629b234c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically 'ttraff.cc'. The document body, though heavily obfuscated, appears to be a lure related to educational materials, attempting to trick users into clicking the malicious link. The presence of numerous external PDF links further suggests a link farm or SEO manipulation tactic to distribute malicious 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.cc/wix?keyword=class+11+chemistry+book+pdf+cbse
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://static.usrfiles.com/ugd/77941b_e30cf1f3b509494eae6ddf6d2361b8a4.pdf
    • https://static.usrfiles.com/ugd/c4ccc4_dc8101e15a134becbaaaab2f799ca850.pdf
    • https://static.usrfiles.com/ugd/b8c837_c57a39f659d94095ad8bea18dad3c719.pdf
    • https://static.usrfiles.com/ugd/b4a829_3b79ca69951649d098ba72bfe6fe7b9b.pdf
    • https://static.usrfiles.com/ugd/c5d40f_ff29c70f86654abe8e4b94924a16d422.pdf
    • https://cdn.shopify.com/s/files/1/0430/2359/7725/files/kemozusuxoguzodo.pdf
    • https://cdn.shopify.com/s/files/1/0429/2712/8735/files/vizirebelujuzaken.pdf
    • https://cdn.shopify.com/s/files/1/0434/5479/1832/files/pesakarunawekiw.pdf
    • https://static.usrfiles.com/ugd/784815_aa22bf8355da435f8113e829bcfbb3ef.pdf
    • https://static.usrfiles.com/ugd/a18aa6_d7022bef68084ac58ec9733c8a817cc3.pdf
    • https://static.usrfiles.com/ugd/40512e_84c9f47d135e455891437ddc7b0ed3e9.pdf
    • https://static.usrfiles.com/ugd/b916f4_1f01f03f2528421f8fa02b5b76de5f0f.pdf
    • https://static.usrfiles.com/ugd/b8c837_5c954b95b6f746faaf3d307c7670caea.pdf
    • https://static.usrfiles.com/ugd/2f3ac6_e4751053ca0a4ae8a1e282eefb7e4b1e.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066b7.bin
44c0349115abdca58c532913e95fc0b7ee57a34d4fc9c1761fb5e9bbd0ffa5c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66B7 5656 bytes
font_01_sfnt_off000079ca.bin
d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79CA 3720 bytes
font_02_sfnt_off0000852d.bin
8bdae6c372f0d12320f8dbdef2c5400e9a8777fa67f928b178bc90055d44054c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x852D 10020 bytes
font_03_sfnt_off0000a7c8.bin
4c1464ab0db68a843bb0bb27c4862be964f98cd4b7857ab618c551b9c8f42567		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7C8 11704 bytes

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