Malicious PDF — malware analysis report

Static analysis result for SHA-256 0730b250b47a9250…

MALICIOUS

PDF

56.6 KB Created: 2020-08-22 04:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d87237c82721a5e28ffcbf482c21c7e3 SHA-1: 08c3cea8964577f95dfdfd09b3136edec836b78a SHA-256: 0730b250b47a925003bdb57740e986fa3ec7e0e43888f6a17f32a8faf46d37c2
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for academic documents, and the presence of a password archive lure heuristic suggests a multi-stage attack. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.ru/pify?keyword=up+deled+2nd+semester+date+sheet
    • http://files.baitboatkit.com/uploads/1/3/1/8/131872054/6eca82a07a99891.pdf
    • http://files.pranicspark.com/uploads/1/3/1/3/131398143/muted_febef.pdf
    • http://files.willowoodfurniture.com/uploads/1/3/2/6/132695351/19998273d.pdf
    • http://saves.gammaetaepsilondkg.com/uploads/1/3/0/7/130739897/fowaridu.pdf
    • http://siropuz.alamodekabashsewingshop.com/uploads/1/3/0/8/130874043/99321.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0431/8891/2290/files/js_blob.pdf
    • https://cdn.shopify.com/s/files/1/0431/0443/6390/files/73195337834.pdf
    • https://cdn.shopify.com/s/files/1/0432/1368/4891/files/neurotransmisor_acetilcolina_funcion.pdf
    • https://cdn.shopify.com/s/files/1/0440/6883/1382/files/analysing_survey_data.pdf
    • https://cdn.shopify.com/s/files/1/0439/3956/1630/files/rexekimadanaminitabog.pdf
    • https://cdn.shopify.com/s/files/1/0431/2940/5600/files/17155836987.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7700/files/benubili.pdf
    • https://cdn.shopify.com/s/files/1/0435/3723/6119/files/sokusojonotevowe.pdf
    • https://cdn.shopify.com/s/files/1/0433/6173/0718/files/xulukorigizavowuwarabin.pdf
    • https://cdn.shopify.com/s/files/1/0431/3369/8209/files/60250530598.pdf
    • https://cdn.shopify.com/s/files/1/0437/8977/9106/files/72331620210.pdf
    • https://cdn.shopify.com/s/files/1/0431/5811/0363/files/kujalolebavagolim.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006952.bin
c98160a8903d546ff431fa5fb830f42751782324d43d29ddb22be5a79e9e3027		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6952 5320 bytes
font_01_sfnt_off00007b3a.bin
d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B3A 3720 bytes
font_02_sfnt_off0000869d.bin
a516c0ce46efc1562f6ce5d8b384d34a93dbb0b72cb004315a52c5ddae555eb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x869D 14152 bytes
font_03_sfnt_off0000b29d.bin
a7af80f5a82cedd0d9f74f496b5f263bd841e36155b20ce8d8f3402bb326f8c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB29D 9968 bytes

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