Malicious PDF — malware analysis report

Static analysis result for SHA-256 7550072ac17b2f43…

MALICIOUS

PDF

41.0 KB Created: 2020-10-28 10:58:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 22018d8d65ae3286ffd0c57972958386 SHA-1: 7cc6ad9e93a9445a60a91875d93a3572d1f3daaa SHA-256: 7550072ac17b2f437ed6ff2813b389a18911e65f45e0f40b1a401623ee260efd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a known malicious redirector, ggtraff.ru. The document body, though heavily obfuscated, contains text related to 'simplifying square roots worksheet pdf' and the malicious URL, suggesting a lure for SEO poisoning. The heuristic firings confirm the presence of malicious redirector links and a link farm, indicating an attempt to drive traffic to malicious sites.

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=simplifying+square+roots+worksheet+pdf In PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/155011.pdfIn PDF document text
    • https://babinekisifuve.weebly.com/uploads/1/3/2/6/132696104/b89edc097.pdfIn PDF document text
    • https://bilimetib.weebly.com/uploads/1/3/4/4/134435282/bb00eedc8502e.pdfIn PDF document text
    • https://pisanofinupu.weebly.com/uploads/1/3/1/4/131437881/gunokukefemo.pdfIn PDF document text
    • https://samomalekadoj.weebly.com/uploads/1/3/1/4/131438786/2219830.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/1151764c-effb-4cce-9dd4-5fcb72d546ed/41764653989.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22487291-44f5-4893-9581-cf328722e10e/27010767102.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/634349f9-b640-487d-b363-3aab86f40397/nefobowutikef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2005c6c-c7b3-4bff-ac1c-450d4c5ecfeb/57562172515.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/2951385876.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/blowfish_algorithm_explanation_with_example.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/zorugebapokirewapuf.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/13200112667.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/zuwodafapibonarakito.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/43503238261.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/baguka.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/pijaxogiles.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/69260040533.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1966/3522/files/research_proposal_questions_and_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9376/3251/files/hierba_mala_nunca_muere_in_italian.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/zoruduxuruf.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/bitsat_2019_syllabus_download.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_off0000601f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x601F 5944 bytes
SHA-256: 79f2568114412fa860d61de54e218094bbe96fd28eedb86a2a33f33ef91c2b5f
font_01_sfnt_off0000743a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x743A 10060 bytes
SHA-256: 9673e1008578a5c01670f1fbe5a2c8dcc47834640922a9fcf783fe6e77e5dd4a

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