Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e92cba9cd2136ac…

MALICIOUS

PDF

53.7 KB Created: 2020-09-04 00:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 48fa5f3b90da20f20b7044130d94c9fe SHA-1: dd84eff83c333c7fd5b71b49104e022d82b25d93 SHA-256: 5e92cba9cd2136ac06cd09a07ffc4610b34eda256be3b33d36e26b4419a329c4
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 resources, a behavior flagged as a 'PDF_SEO_LINK_FARM'. One of these links, 'https://ttraff.cc/wix?keyword=how+is+acoustic+neuroma+surgery+performed', is identified as a malicious redirector. The document body, though partially corrupted, contains the same title and URL, suggesting a lure to direct users to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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=how+is+acoustic+neuroma+surgery+performed
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/defd8a_c70dd6c3ac544af082d5a8cffc2aaeca.pdf
    • https://static.usrfiles.com/ugd/b148e5_2072bf5d194c46eeb21e95969b447862.pdf
    • https://static.usrfiles.com/ugd/b8c837_d79ba2ac39c94ca3a3c2490f553ca69d.pdf
    • https://static.usrfiles.com/ugd/2f7489_64e92463fc764987912be706099f5a5d.pdf
    • https://static.usrfiles.com/ugd/b8c837_87cbba97ed3043f890761bdf6991f9dd.pdf
    • https://cdn.shopify.com/s/files/1/0438/5737/9488/files/74805054765.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gevuruliwineda.pdf
    • https://cdn.shopify.com/s/files/1/0432/8154/7428/files/63344320281.pdf
    • https://cdn.shopify.com/s/files/1/0431/1167/8114/files/98662248449.pdf
    • https://cdn.shopify.com/s/files/1/0432/1892/7776/files/83826192160.pdf
    • https://cdn.shopify.com/s/files/1/0427/4615/1078/files/kipavovigabuvexu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/27622062760.pdf
    • https://cdn.shopify.com/s/files/1/0434/1481/4885/files/doxefame.pdf
    • https://cdn.shopify.com/s/files/1/0435/4677/1607/files/58227662571.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_off0000855b.bin
e33ef25a4a936e520312c146abde3a01948cc37aae79db519aeefdd7d575d47b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x855B 5480 bytes
font_01_sfnt_off000097fd.bin
875c1c39c1be2667400217d21654fc9c5bd1815a5c7570341c5ea08f573d9d8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97FD 10332 bytes
font_02_sfnt_off0000bb55.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB55 4324 bytes

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