Malicious PDF — malware analysis report

Static analysis result for SHA-256 648f1899b1974585…

MALICIOUS

PDF

51.4 KB Created: 2020-09-09 01:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea7d41c0a6f8c7806071b80ab75533eb SHA-1: 29685ca7aef336223c15f86f8c75482abfa60a15 SHA-256: 648f1899b197458538d7686031fb5faf423e499ceef91ea4d6203100ff10ae4a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a mass of external links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL that leads to this redirector, disguised as a worksheet. This suggests an attempt to trick users into visiting a malicious site, likely for phishing or to download further malware.

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=worksheet%2523+1+factoring+polynomials+gcf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/469aea_6b666cc7c7804c7cab5919f250c6afe7.pdf
    • https://static.usrfiles.com/ugd/8ac1ab_4489a3818f0d4f7b9e9e56f0b47a8705.pdf
    • https://static.usrfiles.com/ugd/b7ab08_7e4559181fb24cb3988bf9d8759793f0.pdf
    • https://static.usrfiles.com/ugd/6924eb_e77aa93752984ecda26507923b29fb85.pdf
    • https://static.usrfiles.com/ugd/12dc78_19b89bd137f543f08d106a0acb729bd1.pdf
    • https://static.usrfiles.com/ugd/c70c35_f107bc4a81fb4ad990d9c32ede465f20.pdf
    • https://static.usrfiles.com/ugd/49488e_8aff4555cc95414c87476539c1622f12.pdf
    • https://static.usrfiles.com/ugd/0779a3_e692fb9679aa4f57841ca285fedcc7a1.pdf
    • https://static.usrfiles.com/ugd/0ebc1f_4acec88601c74d08980b7fae80330e09.pdf
    • https://cdn.shopify.com/s/files/1/0433/5868/3291/files/quaresma_de_sao_miguel.pdf
    • https://cdn.shopify.com/s/files/1/0431/5666/8565/files/water_bioremediation.pdf
    • https://cdn.shopify.com/s/files/1/0433/3774/4552/files/call_of_cthulhu_character_sheet.pdf
    • https://static.usrfiles.com/ugd/3c9ac1_66ea26732db84ea682333239f5146c09.pdf
    • https://static.usrfiles.com/ugd/6908d7_a997d565fd214c04901cf602160ac886.pdf
    • https://static.usrfiles.com/ugd/b8c837_06f3629ff1844fcb9a9f43b560af8846.pdf
    • https://static.usrfiles.com/ugd/b8c837_756280f7b4e343b4939720676291bbec.pdf
    • https://static.usrfiles.com/ugd/accd1f_4156ba36c63a4086b5c368245addc1f8.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_off00007b19.bin
6378fe13f0a47e289187510ae60b61b3397328b9edee254a1d294637d875b94e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B19 4236 bytes
font_01_sfnt_off0000898e.bin
71d293d98ca18a3797f942b6e1d5f0415435256b6a785254237ae4b9d3d4d89c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x898E 12748 bytes
font_02_sfnt_off0000b30f.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB30F 4324 bytes

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