Malicious PDF — malware analysis report

Static analysis result for SHA-256 884af497e7404a7c…

MALICIOUS

PDF

48.9 KB Created: 2020-07-21 07:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 642e338d75e0e38544f797d032f3c480 SHA-1: c91b17d96848f09bb8a637e29fd48bc8d52423e8 SHA-256: 884af497e7404a7c776ab0b2943005dd7471b2f0e3940f7f12386e4724549eba
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to redirector infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate that these links are designed to lead users to malicious sites, likely for phishing or to download further malware. The ML classifier also strongly flagged this PDF as malicious.

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=guyton%20physiology%20pdf In PDF document text
    • http://files.livyou.org/uploads/1/3/1/3/131379971/pumodazurinil.pdfIn PDF document text
    • http://files.dominicmartinez.com/uploads/1/3/2/7/132710575/pemikovumonoja_xowapodaze.pdfIn PDF document text
    • http://files.takemyhandcaitlin.com/uploads/1/3/1/3/131380848/62635d86f133.pdfIn PDF document text
    • http://files.welcometoamyland.com/uploads/1/3/1/4/131437490/8124888.pdfIn PDF document text
    • http://files.mesajuniors.com/uploads/1/3/1/4/131453749/8056776.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/1/0430/4902/5690/files/pedogak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8052/3681/files/52409669039.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9654/7230/files/ramikusubegadawob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6057/5912/files/19179996745.pdfIn PDF document text
    • https://fanokuvawiza.files.wordpress.com/2020/07/neregixegisipox.pdfIn PDF document text
    • https://kemimabaz.files.wordpress.com/2020/06/49120910528.pdfIn PDF document text
    • https://mewowubo.files.wordpress.com/2020/06/bazuvigoganadalugu.pdfIn PDF document text
    • https://vewulox.files.wordpress.com/2020/07/dofiditojitalutusugovidig.pdfIn PDF document text
    • https://jadulotixen.files.wordpress.com/2020/07/88174340115.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9649/0655/files/1708939273.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0271/4536/files/73597808291.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6030/5825/files/tivavoxowolixapuzirito.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0808/9509/files/dinasevutesemogewakom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/voxetevew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4845/9675/files/86869834466.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6221/5324/files/misarofeliga.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5396/3678/files/88200822421.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/peratexedabapirox.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
🗂 Part of campaign: mesajuniors.com 4 samples

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000080cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80CF 4896 bytes
SHA-256: cb1aef38352e97c4e8ad68f75f1ce2488f1a1b0a21ef0f6345f3ffd649a3cfe2
font_01_sfnt_off0000917a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x917A 11292 bytes
SHA-256: 92c42110888ca5e95bc0ef885f25ce6035b003ae3851f3a2c1b8f0fa68465044