Malicious PDF — malware analysis report

Static analysis result for SHA-256 6481e1b4d02c40f8…

MALICIOUS

PDF

36.5 KB Created: 2020-09-04 21:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4254cf2f43743bbe1608122b50d62b64 SHA-1: 67572df6aa4996c0215ad026408e2b1889163e09 SHA-256: 6481e1b4d02c40f8489e2507eace4bf9f30e071e209bf95aea4d99656fb63f9c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a link to a known malicious redirector, indicating an attempt to direct users to harmful content. The document also features a large number of external PDF links, suggesting it is part of a link farm designed to distribute malicious content. The ML classifier strongly flagged this PDF as malicious.

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.club/wix?keyword=see+below+for+more+information+ne+demek
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/ba2c19_c75c86bb7a3b4ddd9c5e4a705af87c81.pdf
    • https://static.usrfiles.com/ugd/d2057d_4804550502c94b56b65d0245ccf59a9c.pdf
    • https://static.usrfiles.com/ugd/d7ba0f_e426c2f32c9441b895400f83e65ec420.pdf
    • https://static.usrfiles.com/ugd/a43ec6_687e4fa0409c4008b569ae327463e192.pdf
    • https://static.usrfiles.com/ugd/7603ae_05d22745b8164df6861559c009ea0021.pdf
    • https://static.usrfiles.com/ugd/3e9e83_7210cd1d061a4cd48f8e3826ea5a3210.pdf
    • https://static.usrfiles.com/ugd/e2b09b_014642126e97493ebe39088bca3971bb.pdf
    • https://static.usrfiles.com/ugd/4117a9_50e85c04c3584b5d9424545897fd156d.pdf
    • https://static.usrfiles.com/ugd/dba42a_2a5392465e2140cf86b8d9d8ea8afbb0.pdf
    • https://cdn.shopify.com/s/files/1/0435/7370/6913/files/the_meat_buyer_s_guide_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/66656561998.pdf
    • https://cdn.shopify.com/s/files/1/0454/1726/7368/files/anime_character_generator_english.pdf
    • https://cdn.shopify.com/s/files/1/0433/5134/3269/files/abwab_us_sarf.pdf
    • https://static.usrfiles.com/ugd/74c34a_45315c6bcccb49c5ba9a9d61e1aadd3d.pdf
    • https://static.usrfiles.com/ugd/6a22cb_ba738429d12b4bcd85da23ce30024f46.pdf
    • https://static.usrfiles.com/ugd/07625c_52b4993f10e841109ed05356e6a8fe40.pdf
    • https://static.usrfiles.com/ugd/227d0f_646f8a9350bd4291b9966f16f9111cb5.pdf
    • https://static.usrfiles.com/ugd/13ae68_55a5dfb6cdf64015bbbe99cf5c20afbf.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_off00004d5c.bin
a550d65bead52c9f834b0639d24c09f6f401ece362a9b2c93840c3801c3cf781		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D5C 5272 bytes
font_01_sfnt_off00005f48.bin
b6cadcf529a0ca2d1ce040a7121ad8af304d1427430e66e57a02873661486e5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F48 11376 bytes

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