Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1aaaeeacb60898…

MALICIOUS

PDF

39.9 KB Created: 2020-07-13 22:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 765a2a712a43701599d3116c6c988225 SHA-1: 20b5d2b423fbf4fd756e17859fd3d24a2f1e21fe SHA-256: 5a1aaaeeacb6089836856f32fd84279d5bf19e33c6a22aa4158550fd827da309
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically 'https://ttraff.cc/wb?keyword=gyldendal%20formelsamling%20matematikk%20pdf'. This suggests the document is designed to redirect users to malicious sites, likely for phishing or malware distribution.

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/wb?keyword=gyldendal%20formelsamling%20matematikk%20pdf In PDF document text
    • http://files.vancareproject.ca/uploads/1/3/1/3/131384171/badavukijuvif_gapunebap_jezaxobakivoj.pdfIn PDF document text
    • http://files.dpdesq.com/uploads/1/3/0/8/130874352/628c8578a5.pdfIn PDF document text
    • http://files.knochsoftball.com/uploads/1/3/0/7/130739782/6411530.pdfIn PDF document text
    • http://files.nrshamerica.org/uploads/1/3/1/4/131437490/lezapusogoxoj_zufamerelarexo_nufagusefenini.pdfIn PDF document text
    • http://files.superbloomcoffee.com/uploads/1/3/1/8/131871704/13bc9f9b3d5a6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://piviraxiwak.files.wordpress.com/2020/07/pejamomexuxegine.pdfIn PDF document text
    • https://rojuribopu.files.wordpress.com/2020/07/11239597405.pdfIn PDF document text
    • https://komimub.files.wordpress.com/2020/06/66275422495.pdfIn PDF document text
    • https://zulafavodu.files.wordpress.com/2020/07/taledeze.pdfIn PDF document text
    • https://dafowamu.files.wordpress.com/2020/07/mokafimibidu.pdfIn PDF document text
    • https://jobowinilu.files.wordpress.com/2020/07/zexanuguzirabono.pdfIn PDF document text
    • https://noratum.files.wordpress.com/2020/07/devafarifuvawulewula.pdfIn PDF document text
    • https://jikekivadu.files.wordpress.com/2020/06/tinakatesutamemanu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/peboginesewuxexadamo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sesolofulazige.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8012/2532/files/70249684914.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nuruge.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32732230761.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6037/9286/files/96098850648.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5783/1326/files/mijopilikop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0383/8615/files/tetagonumuzaxogokubewir.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B1C 5344 bytes
SHA-256: 8fd52a07c77f9b1554199492f5f266dcd9a377f973527e3dc7c00a90ab14ec15
font_01_sfnt_off00006d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D45 10472 bytes
SHA-256: f9f392d45c5d52ae1859335a7af7ca038dbde085a9811c2cd4e078b57272c365