Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf262083b9f7a3c…

MALICIOUS

PDF

47.5 KB Created: 2020-10-26 12:48:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: af8c3b078fdd4194e855738388c78995 SHA-1: ef29b88ba610372b1f089de38637c46ce2ee0aca SHA-256: 1bf262083b9f7a3c81d94e5af147b937fd804d48365ac20e48ef5586664fc38d
194 Risk Score

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/aws?keyword=butterflies+are+free+to+fly+pdf In PDF document text
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/154782.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/0827de.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/832302.pdfIn PDF document text
    • https://botubadixebom.weebly.com/uploads/1/3/1/4/131407995/lagezezus_bamidadakevi_wotesegagu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412403/normal_5f964a3887320.pdfIn PDF document text
    • https://wuwenivavubujer.weebly.com/uploads/1/3/1/4/131437756/jiponu-bagebuvi.pdfIn PDF document text
    • https://sewiwojura.weebly.com/uploads/1/3/4/3/134371681/duxuwemigunivej.pdfIn PDF document text
    • https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/320fbc976d2.pdfIn PDF document text
    • https://duririsi.weebly.com/uploads/1/3/4/0/134096382/togan.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00006e0e.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00006e0e.bin)
    • http://www.daltonmaag.com/In extracted file (font_02_sfnt_off0000a33a.bin)
    • https://s3.amazonaws.com/felasorarabipis/50008540545.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/21879331049.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/gestational_diabetes_mellitus_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/introduction_to_statistical_learning_solutions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6444/9431/files/79807049670.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/2726/6217/files/68297665914.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 extracted file (font_00_sfnt_off00006e0e.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E0E 4964 bytes
SHA-256: 0361590eb7f05330ce82d6f681de35986cc233c87f0313c8230eef5d7a6109c8
font_01_sfnt_off00007f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F11 10848 bytes
SHA-256: c0dbd5a86657cb36984d8587b921a4b6312264d6b623ed148c28487ced1920bf
font_02_sfnt_off0000a33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA33A 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71