Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdfcadbf4883a9f5…

MALICIOUS

PDF

41.1 KB Created: 2020-07-08 19:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-25
MD5: 78338c03097fd5d5f488c9ddb11686c1 SHA-1: ef45c717aa4d15cc58f47843af288bc405bf9f14 SHA-256: cdfcadbf4883a9f546bddf15f5f48aec4326fe570569541d83c439f70265e0e2
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to suspicious domains. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates that at least one of these links directs to known malicious infrastructure. The document body, while containing garbled text, also includes the URL https://ttraff.ru/wb?keyword=fraction%20addition%20and%20subtraction%20worksheets%20with%20unlike%20denominators, which is flagged as malicious. This suggests a social engineering attempt to redirect users to harmful 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.
  • 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://ttraff.ru/wb?keyword=fraction%20addition%20and%20subtraction%20worksheets%20with%20unlike%20denominators In PDF document text
    • http://files.nurturedbirthservices.com/uploads/1/3/0/8/130813646/6143167.pdfIn PDF document text
    • http://files.portageresourceguide.com/uploads/1/3/1/6/131606644/8719065.pdfIn PDF document text
    • http://files.trevorbalthrop.com/uploads/1/3/1/4/131453496/ac0547cc0.pdfIn PDF document text
    • http://files.encounterweightloss.com/uploads/1/3/1/4/131437445/4108098.pdfIn PDF document text
    • http://files.refurbishedca.com/uploads/1/3/0/8/130873975/8452518.pdfIn PDF document text
    • http://files.nmoc.co.uk/uploads/1/3/1/3/131384660/nixod_vitigejive_nevafapo_madafegamadabe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://xupezuvu.files.wordpress.com/2020/07/10611420168.pdfIn PDF document text
    • https://sirukozexaj37566172.files.wordpress.com/2020/07/12616192272.pdfIn PDF document text
    • https://xovezuxa802976098.files.wordpress.com/2020/07/tatifajojakazexo.pdfIn PDF document text
    • https://xuzetepevot.files.wordpress.com/2020/07/numolisexupofiwajof.pdfIn PDF document text
    • https://mavuzomis.files.wordpress.com/2020/06/17028143328.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75904593322.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86372263330.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86399573169.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xakikalimakimoxe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/41841620016.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zijuk.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000625a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x625A 5312 bytes
SHA-256: 9581499683dc383adf93c7a0b132c729a8265f321e837d5cb6eea0804c6cc594
font_01_sfnt_off00007444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7444 10076 bytes
SHA-256: 18872e54727b9d6164af6ae0c77262d8c1d667bb8d59d87aba0102803283d138

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