Malicious PDF — malware analysis report

Static analysis result for SHA-256 e336b03d36f61466…

MALICIOUS

PDF

50.4 KB Created: 2020-08-31 00:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f17cfd8aea2cbca66ec4b0c26588024b SHA-1: 56f5700f58bcc937c7b8196bfebf84936f02270d SHA-256: e336b03d36f614669a1db4c145e6d402e4acc07f6ed4bf327f8efee2bf93f2d0
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The document body, though partially corrupted, contains the text 'Virginia bergin the storm' and the malicious URL 'https://ttraff.cc/wix?keyword=virginia+bergin+the+storm'. The presence of numerous external PDF links, many hosted on static.usrfiles.com, suggests a link farm or SEO poisoning tactic to lure victims. 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=virginia+bergin+the+storm
    • https://static.usrfiles.com/ugd/a2ebd8_156171ad16214e5ab67e458c26713cb9.pdf
    • https://static.usrfiles.com/ugd/b8c837_931200a67fff4940b176ef1a7a5e02f0.pdf
    • https://static.usrfiles.com/ugd/b8c837_e5ee22d5d4194382b5ba869f65d86ee1.pdf
    • https://static.usrfiles.com/ugd/b8c837_6c106e07f52c403bb00a9ab8189df849.pdf
    • https://static.usrfiles.com/ugd/5fd5c1_ce4d9dd058d74f57b2ef4c69dd02ccd5.pdf
    • https://cdn.shopify.com/s/files/1/0428/9455/7351/files/nurosaganimesorapun.pdf
    • https://cdn.shopify.com/s/files/1/0429/2945/5271/files/luzovazemujubarasamakuk.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/12997236869.pdf
    • https://cdn.shopify.com/s/files/1/0462/7221/7237/files/nccn_guidelines_management_benign_breast_disease.pdf
    • https://static.usrfiles.com/ugd/b8c837_cec04c638e034c9bb057eca5ea089791.pdf
    • https://static.usrfiles.com/ugd/01e791_e83873c972d24ce7aaf10c5df40bc4b4.pdf
    • https://static.usrfiles.com/ugd/625844_90308a2b108c4ecb8f27f0e94e697403.pdf
    • https://static.usrfiles.com/ugd/f0e51d_9a1493720c514fe5b543bcc9352eabef.pdf
    • https://static.usrfiles.com/ugd/b8c837_d6ded65ed64640508ddf66f5508659ab.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ba4.bin
c600c89e4fe2952928bdb213ee31a22fc35d16d4fafd187a83f07d705e4ae100		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BA4 4960 bytes
font_01_sfnt_off00008c49.bin
e202a3ba5560caef05b699b697d65312d1fc3a24afc7cc81b439d148200dbabf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C49 10120 bytes
font_02_sfnt_off0000aee8.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE8 4324 bytes

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