Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e8ece4b94798f7…

MALICIOUS

PDF

46.4 KB Created: 2020-10-30 18:09:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f151fc215351851177d2507f36fd0bcf SHA-1: 9c3ff997cb68fa7db9fcf4bb645446888b5d6f10 SHA-256: d5e8ece4b94798f7b832c807658daf3ca6705422519e66f9a92ae716a5f9ee0a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded links, identified as a link farm, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the redirector, suggesting a lure to a malicious site. The ML classifier also strongly indicated maliciousness.

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://gettraff.ru/strik?keyword=ge+profile+washing+machine+repair+manual In PDF document text
    • https://visufevulun.weebly.com/uploads/1/3/4/3/134310134/9159690.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365589/normal_5f8babc653f6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392661/normal_5f9102c9e9678.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370074/normal_5f98939a63f3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388421/normal_5f9af1542a046.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366639/normal_5f9b9c9207bc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_5f920f98204e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387430/normal_5f8eff4a25ecc.pdfIn PDF document text
    • https://kiriwalukejogof.weebly.com/uploads/1/3/4/3/134310578/tirilap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385887/normal_5f920f5471ee5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377101/normal_5f9908a54c0bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384820/normal_5f932a0c170fe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zetare/foxapojokusoxalazaturegi.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/types_of_leadership_styles_in_education.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6822 5352 bytes
SHA-256: 65478b798f82ea5812bdd2a008aa893cad3dd06ca905f823c43edc2b7758cbb9
font_01_sfnt_off00007a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A39 10656 bytes
SHA-256: ae0f7e5c90a3ac4e6ebb249147e043d9bf40a69d87cbbf9290b0fc960aeee7a8
font_02_sfnt_off00009eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9EB9 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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