Malicious PDF — malware analysis report

Static analysis result for SHA-256 6320e86ce806d839…

MALICIOUS

PDF

34.6 KB Created: 2020-09-07 18:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2446fd01d76b0915c3112d09c71c0968 SHA-1: 68c5783e564b980da1e9795f17b6b55745ace903 SHA-256: 6320e86ce806d839f3233692f230eb8a0e2221ef35da06cf00b53b361fc443e3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged as malicious by an ML classifier and contains a large number of embedded links, many pointing to external PDFs. One critical heuristic identified a link to known malicious redirector infrastructure, which likely serves as a lure or initial distribution point. The document body contains garbled text but also includes the URL that triggered the redirector heuristic, suggesting an attempt to disguise malicious activity within seemingly legitimate content.

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.link/wix?keyword=aspen+guidelines+enteral+nutrition+intensive+care
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/1703/5166/files/fumolajipuwus.pdf
    • https://cdn.shopify.com/s/files/1/0459/2192/7319/files/89203872126.pdf
    • https://cdn.shopify.com/s/files/1/0433/9888/9621/files/canada_goose_vest_size_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/45292738862.pdf
    • https://cdn.shopify.com/s/files/1/0463/3342/7873/files/27430283745.pdf
    • https://cdn.shopify.com/s/files/1/0440/5575/6965/files/askari_health_insurance_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/0899/1125/files/football_live_tv_apk_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/6225/5013/files/bufanani.pdf
    • https://cdn.shopify.com/s/files/1/0437/7765/4935/files/27760400508.pdf
    • https://static.usrfiles.com/ugd/4cf28d_cfc4e07ccd204f068e849de2a8bb1814.pdf
    • https://static.usrfiles.com/ugd/37987b_e711f12ad2a64e1183be68e5008fa0fc.pdf
    • https://static.usrfiles.com/ugd/ed64d2_9c02fa68b20949db892f0db9ab285247.pdf
    • https://static.usrfiles.com/ugd/769f78_c374479a7178439da78d99fa553c9d45.pdf
    • https://static.usrfiles.com/ugd/f4de5e_d452c1ca7f57454da10fc252c9d378f6.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_off00004a74.bin
8bdef0e4304b5d354620dd2c1625a0c2da7b5fa6ee6cab8ea7c42fdfada9bad8
pdf-font-stream PDF embedded font (sfnt) at offset 0x4A74 5288 bytes
font_01_sfnt_off00005c8d.bin
4ac2a2dcd12f2d269697d4d71cfcfe68f380313d4e812da67797bb31e44ddad2
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C8D 9732 bytes