Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b48b3b105f9d170…

MALICIOUS

PDF

37.9 KB Created: 2020-10-16 03:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ab2a3250893e8bfd62ea182758cfc430 SHA-1: ade57c33ef318efb52a5a1ec0bc959f1f1f1590f SHA-256: 7b48b3b105f9d17016761b9a1fd73ee9c7e918d6ebfbfe4df4b5f90b28a5f69c
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic, suggesting an attempt to direct users to malicious content.

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/wb?keyword=espero%20curarme%20de%20ti%20pdf In PDF document text
    • https://sekojufakov.weebly.com/uploads/1/3/0/7/130776719/xodenog-wezapojewaju.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/zikarab.pdfIn PDF document text
    • https://site-1038567.mozfiles.com/files/1038567/kilokuxiwazatamutu.pdfIn PDF document text
    • https://site-1038357.mozfiles.com/files/1038357/kilazid.pdfIn PDF document text
    • https://site-1044024.mozfiles.com/files/1044024/27753704329.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365608/normal_5f88be47c402d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366306/normal_5f88dd9f00ceb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367940/normal_5f889505e62fc.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/1d7d4ae9-7915-4cf0-b56a-e2fd5e52d77d/79750032648.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8711d083-1121-4fea-b363-e37e98f9a946/viguxukowotij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db193d3b-470f-444b-99cc-0e3f8dc13246/30675328652.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1643099e-6c34-4365-9cb6-12ac5b239c74/18642279236.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b15a6bf-c770-4eba-a848-6cda2e5a9675/95214466782.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aab9f108-bea3-4d4a-b539-8ed69ac63f5b/27606646289.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41ec6dbe-2aa7-442e-819d-fa8d53ef4f01/pefuborevogobemebug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/595f2474-f1a3-4c15-aa40-24ccfb4591d2/62937602036.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d96d271f-9e83-4434-b184-33d0d21f4e85/demovetaxufijomadifabitak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38440580-d3f2-4b90-a91e-3addfb1bc4b9/20816739442.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea33f647-38b4-4ae5-8c4b-5d7bd4b801bb/96146554943.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000053ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53EE 5228 bytes
SHA-256: 681c06268e941c3afdaf4dd3a289df33ee0daa09a738a3d31bffc43725f7d39b
font_01_sfnt_off000065a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65A2 10908 bytes
SHA-256: ea67103ceb14f5a8ee1d1de36a5381fa53493ffd8d69be76304a17ee0246449d

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