Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6bf37074d4ce7aa…

MALICIOUS

PDF

53.6 KB Created: 2020-07-08 19:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-25
MD5: f3ae1d0bf91f00cc9d185b50e766d9b6 SHA-1: 279bc7429839ff6ff91b7c1901f21540c385dad0 SHA-256: d6bf37074d4ce7aa3b7d0cd27a34024d127f5c23d1f52e50c32884b4a782feb2
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors. The document body text, though partially corrupted, includes a URL that appears to be part of a SEO-based link farm designed to attract traffic. The ML classifier also strongly indicated maliciousness.

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=fuentes%20del%20derecho%20internacional%20pdf In PDF document text
    • http://files.elizabethcakesbydesign.com/uploads/1/3/2/6/132682681/0c46fd.pdfIn PDF document text
    • http://files.thealbertafloodroseproject.com/uploads/1/3/0/9/130969555/13cd00738d.pdfIn PDF document text
    • http://files.emilyveneresquire.com/uploads/1/3/0/8/130874495/xusoguwogo-lumunobezakexo-movogiji-damutek.pdfIn PDF document text
    • http://files.newleaforganizingllc.com/uploads/1/3/1/8/131857071/6418065.pdfIn PDF document text
    • http://files.melodyjwang.com/uploads/1/3/1/4/131453725/lobanu.pdfIn PDF document text
    • http://files.jackblairgray.com/uploads/1/3/1/3/131384018/eede518175.pdfIn PDF document text
    • http://files.medfieldheightspto.com/uploads/1/3/1/0/131070190/joridesaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://zelofakoxa.files.wordpress.com/2020/06/44476178249.pdfIn PDF document text
    • https://posuwobi.files.wordpress.com/2020/07/fideper.pdfIn PDF document text
    • https://ponevigafoti.files.wordpress.com/2020/06/50757095288.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75130531250.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/benubojebexoreloruva.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20931566490.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/28650507632.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kupesuditijativerawepafu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/denikiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/54313135065.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_off00009369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9369 5080 bytes
SHA-256: 74c0dd8ec5547e609054132f53ef17bc0e2ab701db10393f32536d696e5e8699
font_01_sfnt_off0000a4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA4A0 10796 bytes
SHA-256: 494f83678d75d584a2193755cc730b52689e70d522cd68b5604179fa29152b93

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