Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c089478646d8f7a…

MALICIOUS

PDF

36.9 KB Created: 2020-11-04 14:08:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b617f9284f2b063bba55a123665164b5 SHA-1: 9446bc9450f27846463fae0008c9bb442f23927c SHA-256: 1c089478646d8f7a177d7c9fe52249b14e06143b4f1e5fdda056dca964612e07
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded URLs, with many pointing to redirector services and link farms, indicating a likely attempt to distribute malicious content or phish users. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a URL leading to known malicious infrastructure. 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://ggtraff.ru/strik?keyword=indio+middle+school+website In PDF document text
    • https://jipepusubame.weebly.com/uploads/1/3/4/0/134040653/3581062.pdfIn PDF document text
    • https://bolififona.weebly.com/uploads/1/3/4/3/134316640/bibutotixidonoduf.pdfIn PDF document text
    • https://segakimorepej.weebly.com/uploads/1/3/0/7/130738797/jesivoli.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/7729626.pdfIn PDF document text
    • https://worobewunit.weebly.com/uploads/1/3/1/4/131406731/teziwulelikowosiw.pdfIn PDF document text
    • https://vuvofazomegudej.weebly.com/uploads/1/3/4/3/134329778/nixuna_durofikozaruwen.pdfIn PDF document text
    • https://wirukibit.weebly.com/uploads/1/3/0/9/130969322/ab30440ce20c0.pdfIn PDF document text
    • https://kexinebig.weebly.com/uploads/1/3/4/3/134338338/fd4d4e20da58.pdfIn PDF document text
    • https://sejabekozifox.weebly.com/uploads/1/3/4/2/134266090/tejoxinegalat_nunifopeme_wotanemoxuludi_gipurujiwor.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/jamokaroxoj/segmentation_et_ciblage_en_marketing.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/31644420059.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/progressive_verb_tense_worksheets_5th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/70-741_download_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/freedom_writers_worksheet_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/74106602363.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/500d4287-ffe0-4570-b5f3-47ac1d7ab804/89337670471.pdfIn PDF document text
    • https://s3.amazonaws.com/kimoweworape/osrs_shilo_village_runehq.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_off00005134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5134 5044 bytes
SHA-256: 790e67beaa46697f746cf35dded426426b3e506dca28bb332d5a1fe9a1c64f8a
font_01_sfnt_off00006249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6249 10760 bytes
SHA-256: ec9f6052ec231dc0e838d6288ff74086c66e0bfb37dd7104d2f11c599492eac4

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