Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d237792d11ba7d8…

MALICIOUS

PDF

40.1 KB Created: 2020-08-07 19:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d1f59ed473f778655fef0eb56195ac0 SHA-1: ec06f06977c3eec79d98ff6013926a57cf7c631b SHA-256: 5d237792d11ba7d8700033e3fdf9a3b16e65fe0471cff8b6fe98d159865fb65a
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 various domains. One of these links, https://ttraff.cc/pify?keyword=agricultural+science+for+jss3+pdf, is identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to contain references to academic content, likely as a lure.

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.cc/pify?keyword=agricultural+science+for+jss3+pdf
    • http://files.hilkerstudio.com/uploads/1/3/2/6/132682542/bineluximobip_dasopivefuvif.pdf
    • http://files.wxrringtxn.com/uploads/1/3/1/8/131856257/mekumokololuxo.pdf
    • http://files.sharedpen.com/uploads/1/3/0/7/130776502/c5b1d0f.pdf
    • http://files.ethanemersonmusic.com/uploads/1/3/0/8/130874284/dirofo.pdf
    • http://files.commonwealthathletics.com/uploads/1/3/0/7/130775665/d8b143e4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3006/0955/files/88776098453.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99913566500.pdf
    • https://cdn.shopify.com/s/files/1/0434/4469/9288/files/abstract_algebra_questions_and_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0432/1263/6322/files/60740643930.pdf
    • https://cdn.shopify.com/s/files/1/0432/8531/5737/files/megasivisidu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1483/1780/files/zagole.pdf
    • https://cdn.shopify.com/s/files/1/0433/5307/9963/files/gta_5_all_cheat_codes_pc.pdf
    • https://cdn.shopify.com/s/files/1/0429/0376/5158/files/25233343498.pdf
    • https://cdn.shopify.com/s/files/1/0434/5013/8784/files/95921943691.pdf
    • https://cdn.shopify.com/s/files/1/0433/6284/4837/files/xobefubuzaporo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1806/7876/files/biosensors_market.pdf
    • https://cdn.shopify.com/s/files/1/0435/2779/8943/files/verizon_real_ringtones.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_off00005d20.bin
12385c5034cecacbd09f63e3186f167b8c87137f8e4c878aabbc520a7ae5c825		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D20 5552 bytes
font_01_sfnt_off0000701d.bin
4a39237ad6733abbaa84610d75f3ba1932eaa0489f4136ee3661d198a47397f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x701D 10408 bytes

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