Malicious PDF — malware analysis report

Static analysis result for SHA-256 584eabc23ff42ef0…

MALICIOUS

PDF

44.0 KB Created: 2020-10-27 11:21:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 297bf55414482338d96af6f379d0945d SHA-1: 90d675dcab21333b5e0a7beb5eadf2f552a378b6 SHA-256: 584eabc23ff42ef03a2a033f53fb79398ec8a531dff99718163f6d16aaa9a022
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing for a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm or phishing attempt, aiming to redirect users to malicious sites like https://cctraff.ru/strik?keyword=benton+head+start.

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/strik?keyword=benton+head+start In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369645/normal_5f89d87fce876.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368235/normal_5f8c6d60cc1c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369626/normal_5f89852ff3be2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379473/normal_5f923f60f05c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366020/normal_5f8983b092385.pdfIn PDF document text
    • https://lozulijulejibog.weebly.com/uploads/1/3/1/8/131857057/c9c5f43.pdfIn PDF document text
    • https://vajibudutoneraz.weebly.com/uploads/1/3/4/3/134345344/42502920b7fbea.pdfIn PDF document text
    • https://larogarokod.weebly.com/uploads/1/3/4/0/134018293/gabalegejabuw.pdfIn PDF document text
    • https://xujaxivef.weebly.com/uploads/1/3/1/4/131438557/binefo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376629/normal_5f91f6afb3fbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411922/normal_5f93b0138acd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381973/normal_5f8e4ff9dcccf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369671/normal_5f8cbdc04bec5.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/guvovigo/75181454094.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/word_biblical_commentary_genesis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6303db3-df8a-48f3-b013-c2a988361b33/14153768176.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bf96b61-9754-4488-9083-d5ddbfc60dfa/new_york_sightseeing_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b6bbfec-362d-496f-9eb2-be654906370f/90761869771.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_off000061ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61CA 4672 bytes
SHA-256: e7d548bd4f34922067f54bced4b576374752d3ad20d7d13b328096a302a4faf7
font_01_sfnt_off0000718d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x718D 10260 bytes
SHA-256: 60e179bfbf022ded03623e62d3828e17abfd2620a113ecc8062eb269abcff794
font_02_sfnt_off000094d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94D7 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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