Malicious PDF — malware analysis report

Static analysis result for SHA-256 64ffe107ac3b8b4a…

MALICIOUS

PDF

47.7 KB Created: 2020-10-26 20:25:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f8e3611abb5bce054da314b2e5b74a65 SHA-1: 817e7f8b17020fde871e82ea872368ac53cff096 SHA-256: 64ffe107ac3b8b4a1080ad7ee7824b886551f9e3003a7122b6fc907ab10f4a89
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to S3 buckets, but one critical link redirects to a known malicious domain. The document body, though heavily obfuscated, contains the same malicious URL. The ML classifier strongly indicates maliciousness, and the PDF structure suggests a link farm designed for SEO manipulation to distribute malware.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?keyword=skyrim+vampire+feeding+animation+mod In PDF document text
    • https://jizonuwuko.weebly.com/uploads/1/3/0/8/130814311/duretazejoso.pdfIn PDF document text
    • https://sujajikozodes.weebly.com/uploads/1/3/1/3/131384638/dc30e00f25d.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/dolopitubolagu.pdfIn PDF document text
    • https://semezuzuxikazug.weebly.com/uploads/1/3/4/2/134234688/6908417.pdfIn PDF document text
    • https://mekuxiwefajup.weebly.com/uploads/1/3/0/7/130739023/8f848537e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369308/normal_5f8bfe88f2107.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368997/normal_5f88877825e82.pdfIn PDF document text
    • https://rogidalot.weebly.com/uploads/1/3/1/6/131636841/todatupuzoj_xupufokorituf_gifinikuvaror_pozuwixonu.pdfIn PDF document text
    • https://jazezuko.weebly.com/uploads/1/3/4/3/134389352/rijamufe.pdfIn PDF document text
    • https://zipalusub.weebly.com/uploads/1/3/4/3/134343211/292353.pdfIn PDF document text
    • https://xazapadikud.weebly.com/uploads/1/3/1/8/131871762/fopizedevefukor.pdfIn PDF document text
    • https://vulewerogoxo.weebly.com/uploads/1/3/4/5/134507491/xisowadaj.pdfIn PDF document text
    • https://rabugotekinevod.weebly.com/uploads/1/3/1/8/131871666/9988250.pdfIn PDF document text
    • https://nikokabiliru.weebly.com/uploads/1/3/1/4/131409463/mowivuwapevezol.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://s3.amazonaws.com/leteraxewe/accountant_resume_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/25762435354.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/free_translate_document_from_french_to_english.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/ap_stylebook_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/download_buku_belajar_membaca_anak_tk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0013/5317/files/dualshock_4_android_lag_fix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/0377/1547/files/java_generics_tutorialspoint.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6695/6184/files/multiplication_tables_test_worksheet.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_off00006d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D05 5268 bytes
SHA-256: 67f4542d61286877e2d374ff34cd6be67990414654bf38afe80fa4304a7b73bb
font_01_sfnt_off00007edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EDD 10676 bytes
SHA-256: 2bfa300b6fb4be01fa23f4aef25a68475dca751c345fa6fffb1a971a3b971bc5
font_02_sfnt_off0000a312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA312 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c