Malicious PDF — malware analysis report

Static analysis result for SHA-256 572d6d49d08c7877…

MALICIOUS

PDF

75.3 KB Created: 2020-10-25 05:32:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d8267b01977a4822184d11f5255d4125 SHA-1: 99faab879018b15dd2e01faa41d4b7b604c8307e SHA-256: 572d6d49d08c787770b1906993994b98b6c9f9e04256d925e2f081543c483d78
194 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains multiple heuristics indicating malicious redirector links. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a PDF download, which redirects to malicious infrastructure. The presence of numerous external PDF links further supports the SEO link farm and redirector tactics.

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://cctraff.ru/123?keyword=la+iliada+y+la+odisea+libro+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383801/normal_5f90985667c51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367642/normal_5f909db537aee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403143/normal_5f94da1106ff8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390097/normal_5f94de4643f3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368971/normal_5f8943e59b4ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368742/normal_5f8b4dc496609.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/ridigozes_gotilukivisabeb_femamozum_dupem.pdfIn PDF document text
    • https://muwidewosavuli.weebly.com/uploads/1/3/4/4/134435377/7677539.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/zirojopemup/adjective_lesson_plan_grade_1.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/9769606694.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/kenya_passport_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/domaxafasuritovapumusef.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/45415213798.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/xanomanemefinosexu.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/44448733954.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/parimejulupaso.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/mu_answer_sheet_toeic_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/jiziboxudawo.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/76469097353.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/sinesopaxud.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/kitowipogejawabarav.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8B 5216 bytes
SHA-256: 57fd44269cccfccec0c297fbc90e3e47a247ac82e6f32f97907b4211b78d249f
font_01_sfnt_off0000dc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5A 13556 bytes
SHA-256: e79847275d3ea868516e5bd57b9eb00059a1b1531546223094f70c210f1d95c2
font_02_sfnt_off00010788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10788 16460 bytes
SHA-256: d40bada7374d944527ee8709ba51b02d0e9de25f73f9b8c24e62ae3778c0dd4f