Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e562e24dfc22cd…

MALICIOUS

PDF

53.8 KB Created: 2020-10-26 11:08:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 84f488e6baeae0eadc20e6bd2420ec50 SHA-1: 37ea88d935206ba979b22c46eec35c701edb8eb9 SHA-256: 71e562e24dfc22cd9781990a89e2bd9693e2c3c4c8303b5ae437ff5591a1111a
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links pointing to external PDF documents, indicating it functions as a link farm. One prominent link, 'https://ttraff.com/123?keyword=target+group+analysis+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the same URLs found in the heuristics, suggesting an attempt to manipulate search engine results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ttraff.com/123?keyword=target+group+analysis+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374835/normal_5f892eaa9d200.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369308/normal_5f87c7e65a798.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404116/normal_5f95c46ccb1fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366304/normal_5f87b9593d8b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372076/normal_5f8a4fd3b74ff.pdfIn PDF document text
    • https://kugakisan.weebly.com/uploads/1/3/4/3/134390280/rodobejuxi.pdfIn PDF document text
    • https://ranerenonosojib.weebly.com/uploads/1/3/1/4/131483420/1132172.pdfIn PDF document text
    • https://jutawalafomas.weebly.com/uploads/1/3/4/3/134316275/4793560.pdfIn PDF document text
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/c7d1b7627f.pdfIn PDF document text
    • https://gogebuzavoriro.weebly.com/uploads/1/3/2/6/132681212/609698b9c390c2.pdfIn PDF document text
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/fetazilu.pdfIn PDF document text
    • https://sozivutapadonen.weebly.com/uploads/1/3/1/1/131164462/2877550.pdfIn PDF document text
    • https://wosezobar.weebly.com/uploads/1/3/1/8/131856012/bfe8426fb8ea8.pdfIn PDF document text
    • https://kelobutino.weebly.com/uploads/1/3/0/9/130969458/bixaki-zozuvo-rarejipoxi.pdfIn PDF document text
    • https://narogigadi.weebly.com/uploads/1/3/0/8/130874066/4153850.pdfIn 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://cdn.shopify.com/s/files/1/0482/9492/0347/files/77685872969.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/8189/2509/files/10446220308.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/3306/7159/files/que_es_la_republica_democratica_alemana.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9085/7121/files/bifagij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/8650/1806/files/tca_handbook_for_ceramic_tile_installation.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/xiroxoguroxiget.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/sotakudozadil.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/best_palmistry_books.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_off000087df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87DF 5144 bytes
SHA-256: c6b8d28858aa78a36697740e9c5f244ca9cad902b7964acf57d4e1a50e173367
font_01_sfnt_off00009974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9974 10056 bytes
SHA-256: 39f40f1aee3af90eb07c22310a51a2f1c303659011b7099b4b65e6ecd0e19a0d
font_02_sfnt_off0000bb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB9E 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361