Malicious PDF — malware analysis report

Static analysis result for SHA-256 7309d4d57cf2ee23…

MALICIOUS

PDF

57.7 KB Created: 2020-11-05 08:44:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: c6d400468665370a98588f6aaaab0a86 SHA-1: 9df7aefd3207954c0347d27aba716d2801c4168e SHA-256: 7309d4d57cf2ee238e2f0332cfea3ff538de5c1d73d99d17ac2048acb9e9f188
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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=fafsa+2019+2020+pdf+parent+signature In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367017/normal_5f872bdeca10f.pdfIn PDF document text
    • https://bavejojonosepes.weebly.com/uploads/1/3/1/3/131380601/buvipulezu_gosoguj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369760/normal_5fa1b0a4eaf41.pdfIn PDF document text
    • https://dedezeke.weebly.com/uploads/1/3/4/4/134494225/8cec701b7932.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369930/normal_5f8aaca15d64b.pdfIn PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/meletopadolavuxutu.pdfIn PDF document text
    • https://rivisoni.weebly.com/uploads/1/3/0/7/130739016/2413756.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369760/normal_5f8fb1df57cf7.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/wanasuvedigo/pegid.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/slow_moving_word_whizzle_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/it_movie_2017_google_drive_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/sozorunepik.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/81502766397.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_off00009752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9752 5612 bytes
SHA-256: 6a1e15b3fd7a097e001176c2407d42deec7551b93edcb5e1c849f82eb3341266
font_01_sfnt_off0000aa7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA7D 13992 bytes
SHA-256: c3350ed6d22552b6e8740a1d6e99f434cec4c2a78362eca5113b23a33e21006b

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