Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf7faf7161bceaef…

MALICIOUS

PDF

47.3 KB Created: 2020-11-07 07:24:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4f812f686c152224715292c9f709697f SHA-1: 9690132dc8100b70240803f09db1fb0cd8e1e321 SHA-256: bf7faf7161bceaefee8c23eb969cc98ff46e8d1cf313027a039449e701852b93
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure and a link farm of external PDFs. The embedded document body, though heavily obfuscated, contains a URL that matches the malicious redirector. This suggests the document's primary purpose is to redirect users to malicious sites, potentially for phishing or malware distribution.

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/aws?keyword=list+of+ch+words+speech+therapy In 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://uploads.strikinglycdn.com/files/34503f2f-dfee-4034-8099-fc0d96a75603/9043944422.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/robirixaki.pdfIn PDF document text
    • https://monirasuwa.files.wordpress.com/2020/11/33363284578.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/kaxumumu.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/the_longman_writer_9th_edition.pdfIn PDF document text
    • https://sisiviweze.files.wordpress.com/2020/11/50939477702.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/distant_worlds_universe_2_release_date.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/7363756497.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40d401fd-c2f5-48be-9372-8dde5b6d25b2/4156558247.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/39736227537.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/578e5304-76d7-497a-b1d9-f93ebb45054e/modulo_23_semana_4_fase_final.pdfIn PDF document text
    • https://xarewexupi.files.wordpress.com/2020/11/gitaxoxukujuwogababaxer.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/free_printable_ged_practice_test_2020.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_off00006e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E08 5028 bytes
SHA-256: 2d181b0f0465524e8e23d30cee6a548bd7f1de6502f16276dfacd988ff5c8f45
font_01_sfnt_off00007f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F4F 10268 bytes
SHA-256: b21b05dd4134ed3e23eb66aba18f089339f3bfcd431a6cf5c45d94ac0aa46202
font_02_sfnt_off0000a24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA24C 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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