Malicious PDF — malware analysis report

Static analysis result for SHA-256 86609471c9516093…

MALICIOUS

PDF

49.5 KB Created: 2020-10-02 00:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b991cbd9588767a5d4e4a8558d35090 SHA-1: 4edabe0be45f3dcecdb1b927e98d9bd3741165cc SHA-256: 86609471c951609335d2aafd68191a79c2254ed4f34aa2c748f800b1cc8f2959
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, many of which point to suspicious domains and are indicative of a link farm or SEO poisoning attack. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting an attempt to funnel users to malicious content. The document body, while containing academic-sounding text, is primarily a vehicle for these links.

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://cctraff.ru/mozel?keyword=second+law+of+thermodynamics+in+terms+of+entropy+pdf
    • http://files.walkersvillechristkindlmarket.com/uploads/1/3/0/7/130739028/3332948.pdf
    • http://fezov.carolineuahn.com/uploads/1/3/1/4/131452988/pobib_kovazerurib.pdf
    • http://files.jenniferconstanceleeart.com/uploads/1/3/1/3/131379420/2457746.pdf
    • http://files.tax-america.net/uploads/1/3/0/7/130776069/7453342.pdf
    • http://files.3800southcicero.com/uploads/1/3/1/4/131437554/dutuvazunufetunuduzu.pdf
    • http://mefogovu.virtu.rocks/uploads/1/3/1/3/131379373/d5bd539ea95c5.pdf
    • http://files.bethlehembaptistchurchsaginaw.com/uploads/1/3/0/7/130776674/wexuganowad.pdf
    • http://pufare.wall-in.com/uploads/1/3/2/6/132696067/guwidotajagipigadi.pdf
    • http://wupilapa.mad4mosaic.com/uploads/1/3/1/4/131407535/ruluvesevumunumu.pdf
    • http://mivev.hopedia-mendministries.com/uploads/1/3/1/6/131636655/kutuzagewuvuror.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/2865/9869/files/postoperative_nausea_vomiting_icd_10.pdf
    • https://cdn.shopify.com/s/files/1/0483/8568/7703/files/square_manual_entry_limit.pdf
    • https://cdn.shopify.com/s/files/1/0434/0462/4021/files/questions_for_ada.pdf
    • https://cdn.shopify.com/s/files/1/0476/7396/6758/files/novena_a_san_judas_tadeo_casos_dificiles.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c0a.bin
f22fe2d6b91b280ff58cff8324542bd69871ea2315b1f40da649426ea136d911		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C0A 5480 bytes
font_01_sfnt_off00007e8a.bin
ba4fe5e27c3e75a78267cc874363bcb21fb52240b7a5629fa17cc59e4dc48647		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E8A 13952 bytes
font_02_sfnt_off0000aa96.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA96 4324 bytes

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