Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c5d87d6b11edb7…

MALICIOUS

PDF

67.7 KB Created: 2020-10-09 05:33:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 279493c260a3d09c756862d4691050a8 SHA-1: d5e8a821824eac8af96842051bc899af21b020c7 SHA-256: e1c5d87d6b11edb760143775337548db9959497d88b2dd63bedc0c25219fcde2
154 Risk Score

Malware Insights

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

The PDF contains a prompt to complete sentences, which is a common social engineering tactic. It embeds numerous links, with one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious infrastructure, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.club/pify?keyword=completa+las+oraciones+seg%25C3%25BAn+la+lectura In PDF document text
    • http://zopopek.lawsontrek.com/uploads/1/3/1/3/131380429/sexase.pdfIn PDF document text
    • http://files.windycrestdesign.com/uploads/1/3/1/3/131381240/bd512b9.pdfIn PDF document text
    • http://misera.norwichsurgicalsociety.org.uk/uploads/1/3/0/7/130775034/5090647.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/51ef3748-ad4c-4861-9041-881da6cd1ae6/nixilijuwowax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b34ad742-7267-44e6-a246-068fdea2d266/79594662427.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c994e32d-7a2b-48e4-8c04-f90724431d14/80791951379.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5546f3c-c7fd-46b4-abc1-293edb50113b/jaxezojunixur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/679e97f5-4dd0-442b-aa05-d6084c77638f/73787226458.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba9ffda2-c1c1-4ff2-927e-6d3eaa311a22/53898708917.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c16fb73-1637-4759-a143-ecdf2ca14699/warelisowuwagodosekolo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8263/2347/files/7451156144.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8999/3621/files/nitibogumugigijira.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5290/3831/files/dorothy_lynch_salad_dressing_nutrition.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_off0000c84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC84A 5276 bytes
SHA-256: 88eb5e9979a8a4542759a635240cda76f2e066fcd42e956e500d315cdbbfa29f
font_01_sfnt_off0000d9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E6 11676 bytes
SHA-256: c50c9bc1e10d4dd8440082fe2c33f82b285d6ca09b3e0ac3eb3aaf01cb5441ce

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