Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e20ac770e8a35a0…

MALICIOUS

PDF

75.7 KB Created: 2020-11-06 04:01:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: cce99c663d4d140f8e7edc7dea6c3f3c SHA-1: 3c0bfacb26acbe44c27c4a19b0b40555eb7a7b89 SHA-256: 9e20ac770e8a35a077aa60b8b7a7b1acfb2b94a3b62f49118332905782c357b5
162 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with at least one identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous links and the redirector suggest an attempt to lead the user to a malicious site, potentially for phishing or malware distribution.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/aws?keyword=bonding+basics+practice+page+answer+key In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379959/normal_5f93c5363dab0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379974/normal_5f954ced924fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402960/normal_5f958519d1f36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393041/normal_5f94f11bd7aee.pdfIn PDF document text
    • https://fosogaji.weebly.com/uploads/1/3/1/4/131455903/rorobadokikagenavone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367311/normal_5fa47c42ad5e5.pdfIn PDF document text
    • https://purolejomi.weebly.com/uploads/1/3/0/7/130776639/9863192.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370317/normal_5f9123acadeac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/06e50e4e-b7a7-4957-933c-1d539e4e1fe5/witch_on_broom_emoji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5db7cd29-7a46-4b77-9b4a-5da11e9a8082/93405910307.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dae5a4fd-4dc0-473c-a275-ad2af640546b/mandalas_para_colorear_con_operacion.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/dozotelifukuvadiliga.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/xaxuribedeguji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffeb6383-e9e3-41bf-bc11-6048409a5eb1/Darmkrebs_Stadium_3c_Behandlung.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0375cf22-15b4-48bd-acfa-ab6cb200aeaa/juragoki.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_off0000de82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE82 2828 bytes
SHA-256: 4aba2bb845853324476be69e5ed1bf4ff35002942389efac2b843cac1129f0e9
font_01_sfnt_off0000e87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87D 5656 bytes
SHA-256: 207e0775a24157b407134b6c6397bbc903cfaeacbca55dcc54ccb1132923df0c
font_02_sfnt_off0000fbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF0 10508 bytes
SHA-256: 00e54b8e17009739a5c365aabf5e8723d9d145d548dbec08dae9c4d9827d3f9e

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