Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd818507a7d727c2…

MALICIOUS

PDF

76.8 KB Created: 2021-01-18 10:27:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 83bac76aa00663a81b04f7a04491b9cb SHA-1: f38a675b5a56e9c99adaa1ac985242a50bdf3574 SHA-256: fd818507a7d727c275397893e65b834263e785f764e7979857f765fa3cbff13f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous embedded links, with at least one identified as a malicious redirector and others forming a link farm. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the presence of a malicious redirector and a large number of external links suggests an attempt to lead the user to malicious content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=henrietta+lacks+immortal+cells+answer+key In PDF document text
    • https://gixujadimi.weebly.com/uploads/1/3/4/7/134708567/9615190.pdfIn PDF document text
    • https://faliroralomi.weebly.com/uploads/1/3/0/8/130874474/f3a4358f.pdfIn PDF document text
    • https://cdn.sqhk.co/juxerawabuf/ijicoxP/taxi_driver_game_download_2020.pdfIn PDF document text
    • https://tajubebejuxota.weebly.com/uploads/1/3/4/4/134477440/5816187.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403824/normal_5fc96c7b0611e.pdfIn PDF document text
    • https://buritozube.weebly.com/uploads/1/3/0/7/130775753/5146917.pdfIn PDF document text
    • https://cdn.sqhk.co/xomorenut/ficgd5k/castle_hustle_arena_brackets.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450426/normal_5ff2aa5a0a85a.pdfIn PDF document text
    • https://cdn.sqhk.co/pitadewedobu/PILhigf/wotarasaxivekugosut.pdfIn PDF document text
    • https://rixukiwifezi.weebly.com/uploads/1/3/5/3/135392959/78db44d62185a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/answers_to_interview_questions_for_nurses.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/books_to_read_in_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/29674291907.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/vojisifujixuxuzapibawoje.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/tezanebagavemarivaje.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/checkered_pattern_photoshop.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/adobe_illustrator_cs6_free_software.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/backcountry_skiing_colorado_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/dragon_nest_sea_mobile_class_guide.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_off0000effe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFE 5164 bytes
SHA-256: 69fd38313184832c323d76869a1a9a9aa3bc8e3b6a03cf8ea2da9d87b8b996fc
font_01_sfnt_off0001018a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018A 10580 bytes
SHA-256: c7a59fe5b6365af5f004a0417eb86650d5504270267654186f1eb18aee1455c6

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