Malicious PDF — malware analysis report

Static analysis result for SHA-256 86fd930be631d677…

MALICIOUS

PDF

42.5 KB Created: 2020-08-19 20:38:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 817043a7ec68f8f679bcef938d22d6fd SHA-1: e823a272e5d3444f9c04861ec7d662f166033979 SHA-256: 86fd930be631d67736ac7290d4d352d74d89238e00bb2b4528657f31427e1154
194 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified as a redirector for SEO-based phishing. The document body, though heavily obfuscated, contains text suggesting it is a presentation for children, which is likely a lure. The ML classifier strongly indicated maliciousness, and the presence of multiple links to redirectors and benign-looking PDFs points to a link farm or phishing attempt.

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.cc/pify?keyword=ameryka+p%25C3%25B3%25C5%2582nocna+informacje+dla+dzieci+prezentacja In PDF document text
    • http://nuluruj.kristinescreationsonline.com/uploads/1/3/0/7/130775607/91f9a0fcf87f.pdfIn PDF document text
    • http://potolojuf.goodindeedmusic.co.uk/uploads/1/3/2/8/132814930/631680.pdfIn PDF document text
    • http://dimusoz.kaibauer.com/uploads/1/3/0/7/130739664/pikelupetov.pdfIn PDF document text
    • http://rurapu.firststreettoycompany.com/uploads/1/3/0/7/130740596/weravi-ratelotagamibi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7054/6329/files/tedebolu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86662201832.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/84860081798.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5093/3155/files/clasificacion_de_anemias_hemoliticas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/99203043279.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7541/9798/files/cheadle_hulme_school_uniform.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mojedisubeweful.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6451/7023/files/porerinujade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4828/7912/files/88579693938.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9925/1093/files/41345514240.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_off0000643e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x643E 5596 bytes
SHA-256: edbed21a88d36995ee75a5e5e251fb218fa95d8ce2074b0b951b199e2323d0c2
font_01_sfnt_off00007708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7708 11140 bytes
SHA-256: 39259fa9c750f4bd540c822ca3a63bf6a0f82c70bc251d28d6300b3d52ccd028

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