Malicious PDF — malware analysis report

Static analysis result for SHA-256 183f0aa9c245945b…

MALICIOUS

PDF

40.6 KB Created: 2020-08-31 18:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71058b76279d4142d405483a97ca1738 SHA-1: dd0a93be9fadc0db572094bceb94e7d0257e48f1 SHA-256: 183f0aa9c245945b584fb2ea02037c4838766d519b43cce7649b99c5eb95a7f0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Shopify and other platforms, forming a link farm. One prominent link directs to a known malicious redirector infrastructure at ttraff.com. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to drive traffic to malicious sites, likely for further exploitation or phishing.

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.com/wix?keyword=badminton+score+sheet+printable
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5082/6919/files/nudutise.pdf
    • https://cdn.shopify.com/s/files/1/0432/5877/3662/files/jiwudonafunekixulek.pdf
    • https://cdn.shopify.com/s/files/1/0430/0275/7281/files/7385365857.pdf
    • https://cdn.shopify.com/s/files/1/0432/4858/2820/files/windows_10_software_crack_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0434/7920/4006/files/10708443549.pdf
    • https://static.usrfiles.com/ugd/b8c837_c7112932bd574c32bcf9b88ad9cab949.pdf
    • https://static.usrfiles.com/ugd/cc14e4_92343f29edba42348de8d3f75819d240.pdf
    • https://static.usrfiles.com/ugd/cf14a4_313fe8085e1c427ca4610c5b8da1036b.pdf
    • https://static.usrfiles.com/ugd/ea5d7b_8848906980eb4ffda229b25f1055d8f6.pdf
    • https://static.usrfiles.com/ugd/f8de3e_8daebd58fee2488a9b73697d185379ef.pdf
    • https://static.usrfiles.com/ugd/bd5c68_738fb567a04548ff899174665d31eb76.pdf
    • https://static.usrfiles.com/ugd/eb4c03_bdd46b5576ba466585845d0698de5ce6.pdf
    • https://static.usrfiles.com/ugd/b8c837_b012b1bd8bbb4e509d7b0874d4704213.pdf
    • https://static.usrfiles.com/ugd/fd30ac_b0aa81a7922e49919cd4f152924301e2.pdf
    • https://static.usrfiles.com/ugd/b8c837_e303e836fcfc4286a25534a1be6a9e77.pdf
    • https://static.usrfiles.com/ugd/cb2bed_821d0a31c85941358dacf570332c47bc.pdf
    • https://static.usrfiles.com/ugd/aff7ca_fa92041df6c74d25b4437664ad33f82c.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_off00006049.bin
23f8c44a48d01532f8e8422a553aa67402a8921ca532f8e5200df04505128fe7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6049 5504 bytes
font_01_sfnt_off000072cc.bin
f24cc07bb38015a5c8c85bcd28217e9d3992185d7f33ab249ac62ba82ea6d619		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72CC 10192 bytes

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