Malicious PDF — malware analysis report

Static analysis result for SHA-256 1de45976006b298f…

MALICIOUS

PDF

94.7 KB Created: 2020-11-02 07:22:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 26d78662869fedd83426a987ee081758 SHA-1: 29e2a56b8455105980cb04e1de6b45ac65f7c047 SHA-256: 1de45976006b298f093d66bd812ad63b0b3acb8a2a2def499c223cddd9d34b33
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, specifically pointing to 'https://cctraff.ru/aws?keyword=inside+catholic+church+worksheet'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, one of which is 'https://uploads.strikinglycdn.com/files/f28f54bb-ae8f-4d61-a755-9f65888e327d/liang_heng_y_judith_shapiro_hijos_de.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL, suggesting a phishing or malware distribution attempt.

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/aws?keyword=inside+catholic+church+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374542/normal_5f9f0860bfbb6.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/f28f54bb-ae8f-4d61-a755-9f65888e327d/liang_heng_y_judith_shapiro_hijos_de.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/chris_paul_jersey_thunder.pdfIn PDF document text
    • https://s3.amazonaws.com/dazutun/31822469523.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a91ccd6a-ffc7-41dd-897b-43d402338dab/bifebaka.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/84013284480.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aec14622-b66e-4107-ad98-ba76cb280a03/20220121526.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5824/0922/files/84341778927.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f00ab7a6-9055-4f35-a4ea-3ba6ba1ad2be/46995770865.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/doloze.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/team_8-0_still.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/mexum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65dc90ca-6a9d-44fe-ada8-d944d562b771/javinewagefidizesa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/280c42d0-6924-4824-9fae-c9aac61e3494/88098791967.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/public_speaking_skills_for_dummies.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_off00013846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13846 5120 bytes
SHA-256: cd2275f40e9435aa2b07c08a434808aec4ccb2354d0c9c30f514a307daadd5f8
font_01_sfnt_off000149bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149BB 10676 bytes
SHA-256: 6983cbe8f3011d3a0663d736dbb8845dd59c539e9a12f9824ca218f4e0c59a11

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