Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc8169da6993d47…

MALICIOUS

PDF

40.6 KB Created: 2020-11-03 11:38:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 157ccb5f492192913dad2aae8dad26eb SHA-1: dc5706699dda9b80bc3626705ff57337a746b934 SHA-256: 8bc8169da6993d479a83a94e0d3bc28a8e7ce094f2c9011557532fc70eac4fcd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by an ML classifier and contains numerous links to external resources, indicating it is part of a link farm or SEO spam campaign. One of the primary links directs to a known malicious redirector infrastructure, suggesting an attempt to lead users to harmful content. The document body, though heavily obfuscated, contains URLs that are consistent with this malicious activity.

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://ggtraff.ru/aws?keyword=nationals+park+seating+chart+interactive
    • https://cdn-cms.f-static.net/uploads/4378167/normal_5f9707039311a.pdf
    • https://cdn-cms.f-static.net/uploads/4369324/normal_5f89d4183ecba.pdf
    • https://pagejenaxupiwig.weebly.com/uploads/1/3/4/3/134383440/4bc38ac76d2.pdf
    • https://cdn-cms.f-static.net/uploads/4418567/normal_5f9be6c0b7d48.pdf
    • https://cdn-cms.f-static.net/uploads/4393026/normal_5f912bea6f2fa.pdf
    • https://cdn-cms.f-static.net/uploads/4415055/normal_5f96b5cc3bb41.pdf
    • https://cdn-cms.f-static.net/uploads/4415321/normal_5f9dd05b71e3e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/dbd7702a-571e-4939-9021-9e6bce677f3a/61158878448.pdf
    • https://s3.amazonaws.com/pazifetanegapu/negazu.pdf
    • https://s3.amazonaws.com/henghuili-files2/nugad.pdf
    • https://s3.amazonaws.com/nalifij/50205025278.pdf
    • https://s3.amazonaws.com/rizijubovapuk/wedimalezokemelewegulu.pdf
    • https://s3.amazonaws.com/fefurorobumi/likurozedumet.pdf
    • https://uploads.strikinglycdn.com/files/c0ed854e-4da5-4712-b95b-d335d7364d3b/gerubunasesowezuluzi.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_off0000614c.bin
688a6035de06f736fcfacb951673317a6435dac366dfa88683e17217e7730dfa
pdf-font-stream PDF embedded font (sfnt) at offset 0x614C 5288 bytes
font_01_sfnt_off00007351.bin
43d5e5be3c666994b78dd90e6aec7f42642a23d01a6243225101b29922136e63
pdf-font-stream PDF embedded font (sfnt) at offset 0x7351 9900 bytes